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diff --git a/en/11-three-programming-paradigms.md b/en/11-three-programming-paradigms.md
@@ -3,7 +3,7 @@ layout: post
 title: "3 Programming Paradigms"
 date: 2018-08-12 02:31
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://www.amazon.com/Clean-Architecture-Craftsmans-Software-Structure/dp/0134494164

diff --git a/en/12-solid-design-principles.md b/en/12-solid-design-principles.md
@@ -3,7 +3,7 @@ layout: post
 title: "SOLID Design Principles"
 date: 2018-08-13 18:07
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://www.amazon.com/Clean-Architecture-Craftsmans-Software-Structure/dp/0134494164

diff --git a/en/121-designing-facebook-photo-storage.md b/en/121-designing-facebook-photo-storage.md
@@ -3,7 +3,7 @@ layout: post
 title: "Designing Facebook photo storage"
 date: 2019-01-04 12:11
 comments: true
-categories: categories
+categories: system design
 language: en
 references:
   - https://www.usenix.org/conference/osdi10/finding-needle-haystack-facebooks-photo-storage

diff --git a/en/122-key-value-cache.md b/en/122-key-value-cache.md
@@ -4,6 +4,7 @@ title: "Key value cache"
 date: 2019-01-06 23:24
 comments: true
 language: en
+categories: system design
 ---
 
 KV cache is like a giant hash map and used to reduce the latency of data access, typically by

diff --git a/en/123-ios-architecture-patterns-revisited.md b/en/123-ios-architecture-patterns-revisited.md
@@ -5,6 +5,7 @@ date: 2019-01-10 02:26
 comments: true
 categories: architecture, mobile
 language: en
+categories: system design
 references:
   - https://medium.com/ios-os-x-development/ios-architecture-patterns-ecba4c38de52
 ---

diff --git a/en/137-stream-and-batch-processing.md b/en/137-stream-and-batch-processing.md
@@ -3,7 +3,7 @@ layout: post
 title: "Stream and Batch Processing Frameworks"
 date: 2019-02-16 22:13
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://storage.googleapis.com/pub-tools-public-publication-data/pdf/43864.pdf

diff --git a/en/145-introduction-to-architecture.md b/en/145-introduction-to-architecture.md
@@ -3,7 +3,7 @@ layout: post
 title: "Introduction to Architecture"
 date: 2019-05-11 15:52
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://puncsky.com/notes/10-thinking-software-architecture-as-physical-buildings

diff --git a/en/169-how-to-write-solid-code.md b/en/169-how-to-write-solid-code.md
@@ -3,7 +3,7 @@ layout: post
 title: "How to write solid code?"
 date: 2019-09-25 02:29
 comments: true
-categories: categories
+categories: system design
 language: en
 ---
 

diff --git a/en/178-lyft-marketing-automation-symphony.md b/en/178-lyft-marketing-automation-symphony.md
@@ -3,7 +3,7 @@ layout: post
 title: "Lyft's Marketing Automation Platform -- Symphony"
 date: 2019-10-09 23:30
 comments: true
-categories: marketing, architecture
+categories: marketing, system design
 language: en
 slides: false
 references:

diff --git a/en/2016-02-13-crack-the-system-design-interview.md b/en/2016-02-13-crack-the-system-design-interview.md
@@ -3,7 +3,7 @@ layout: post
 title: "Crack the System Design Interview"
 date: 2016-2-14 01:27
 comments: true
-categories: big_data
+categories: system design
 language: en
 ---
 

diff --git a/en/2018-07-10-cloud-design-patterns.md b/en/2018-07-10-cloud-design-patterns.md
@@ -3,7 +3,7 @@ layout: post
 title: "Cloud Design Patterns"
 date: 2018-07-10 11:16
 comments: true
-categories: design_patterns
+categories: design patterns, system design
 language: en
 references:
   - https://www.slideshare.net/Leananalytics/lean-analytics-for-startups-and-enterprises

diff --git a/en/2018-07-20-experience-deep-dive.md b/en/2018-07-20-experience-deep-dive.md
@@ -3,7 +3,7 @@ layout: post
 title: "Experience Deep Dive"
 date: 2018-07-20 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 ---
 

diff --git a/en/2018-07-21-data-partition-and-routing.md b/en/2018-07-21-data-partition-and-routing.md
@@ -3,7 +3,7 @@ layout: post
 title: "Data Partition and Routing"
 date: 2018-07-20 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 ---
 

diff --git a/en/2018-07-22-b-tree-vs-b-plus-tree.md b/en/2018-07-22-b-tree-vs-b-plus-tree.md
@@ -3,7 +3,7 @@ layout: post
 title: "B tree vs. B+ tree"
 date: 2018-07-22 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 references:
     - https://stackoverflow.com/questions/870218/differences-between-b-trees-and-b-trees

diff --git a/en/2018-07-23-load-balancer-types.md b/en/2018-07-23-load-balancer-types.md
@@ -3,7 +3,7 @@ layout: post
 title: "Load Balancer Types"
 date: 2018-07-23 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 references:
     - https://www.amazon.com/Practice-Cloud-System-Administration-Practices/dp/032194318X

diff --git a/en/2018-07-24-replica-and-consistency.md b/en/2018-07-24-replica-and-consistency.md
@@ -3,7 +3,7 @@ layout: post
 title: "Replica, Consistency, and CAP theorem"
 date: 2018-07-24 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 references:
     - https://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed

diff --git a/en/2018-07-26-acid-vs-base.md b/en/2018-07-26-acid-vs-base.md
@@ -3,7 +3,7 @@ layout: post
 title: "ACID vs BASE"
 date: 2018-07-26 11:54
 comments: true
-categories: system_design_and_architecture
+categories: system design
 language: en
 references:
     - https://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed

diff --git a/en/38-how-to-stream-video-over-http.md b/en/38-how-to-stream-video-over-http.md
@@ -3,7 +3,7 @@ layout: post
 title: "How to stream video over HTTP for mobile devices? HTTP Live Streaming (HLS)"
 date: 2018-09-07 21:32
 comments: true
-categories: interview
+categories: system design
 language: en
 references:
   - https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/HTTPStreamingArchitecture/HTTPStreamingArchitecture.html#//apple_ref/doc/uid/TP40008332-CH101-SW2

diff --git a/en/41-how-to-scale-a-web-service.md b/en/41-how-to-scale-a-web-service.md
@@ -3,7 +3,7 @@ layout: post
 title: "How to scale a web service?"
 date: 2018-09-11 21:32
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://akfpartners.com/growth-blog/scale-cube

diff --git a/en/43-how-to-design-robust-and-predictable-apis-with-idempotency.md b/en/43-how-to-design-robust-and-predictable-apis-with-idempotency.md
@@ -3,7 +3,7 @@ layout: post
 title: "How to design robust and predictable APIs with idempotency?"
 date: 2018-09-12 12:55
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://stripe.com/blog/idempotency

diff --git a/en/45-how-to-design-netflix-view-state-service.md b/en/45-how-to-design-netflix-view-state-service.md
@@ -3,7 +3,7 @@ layout: post
 title: "How Netflix Serves Viewing Data?"
 date: 2018-09-13 20:39
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - http://techblog.netflix.com/2015/01/netflixs-viewing-data-how-we-know-where.html

diff --git a/en/49-facebook-tao.md b/en/49-facebook-tao.md
@@ -3,7 +3,7 @@ layout: post
 title: "How Facebook Scale its Social Graph Store? TAO"
 date: 2018-09-18 22:50
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - http://www.cs.cornell.edu/courses/cs6410/2015fa/slides/tao_atc.pptx

diff --git a/en/61-what-is-apache-kafka.md b/en/61-what-is-apache-kafka.md
@@ -3,7 +3,7 @@ layout: post
 title: "What is Apache Kafka?"
 date: 2018-09-27 04:06
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://kafka.apache.org/intro

diff --git a/en/63-soft-skills-interview.md b/en/63-soft-skills-interview.md
@@ -3,7 +3,7 @@ layout: post
 title: "What can we communicate in soft skills interview?"
 date: 2018-10-01 08:56
 comments: true
-categories: interview
+categories: system design
 language: en
 references:
   - https://www.jianshu.com/p/73b1d5682fd3

diff --git a/en/66-public-api-choices.md b/en/66-public-api-choices.md
@@ -3,7 +3,7 @@ layout: post
 title: "Public API Choices"
 date: 2018-10-04 01:38
 comments: true
-categories: architecture
+categories: system design
 language: en
 ---
 

diff --git a/en/68-bloom-filter.md b/en/68-bloom-filter.md
@@ -3,7 +3,7 @@ layout: post
 title: "Bloom Filter"
 date: 2018-10-09 12:39
 comments: true
-categories: data structures
+categories: system design, data structures
 language: en
 references:
   - https://en.wikipedia.org/wiki/Bloom_filter

diff --git a/en/69-skiplist.md b/en/69-skiplist.md
@@ -3,7 +3,7 @@ layout: post
 title: "Skiplist"
 date: 2018-10-09 12:39
 comments: true
-categories: data structures
+categories: system design, data structures
 language: en
 references:
   - https://en.wikipedia.org/wiki/Skip_list

diff --git a/en/78-four-kinds-of-no-sql.md b/en/78-four-kinds-of-no-sql.md
@@ -3,7 +3,7 @@ layout: post
 title: "4 Kinds of No-SQL"
 date: 2018-10-17 00:49
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview

diff --git a/en/80-relational-database.md b/en/80-relational-database.md
@@ -3,7 +3,7 @@ layout: post
 title: "Intro to Relational Database"
 date: 2018-10-18 23:19
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://www.puncsky.com/blog/2016-02-13-crack-the-system-design-interview

diff --git a/en/83-lambda-architecture.md b/en/83-lambda-architecture.md
@@ -3,7 +3,7 @@ layout: post
 title: "Lambda Architecture"
 date: 2018-10-23 10:30
 comments: true
-categories: architecture
+categories: system design
 language: en
 references:
   - https://www.amazon.com/Big-Data-Principles-practices-scalable/dp/1617290343

diff --git a/zh-CN/125-designing-facebook-photo-storage.md b/zh-CN/125-designing-facebook-photo-storage.md
@@ -3,8 +3,9 @@ layout: post
 title: "设计Facebook图片存储系统"
 date: 2019-01-14 18:09
 comments: true
-categories: categories
+categories: system design
 language: zh-cn
+abstract: Facebook做图片存储的原因有两个：PB级别的Blob数据量；传统的基于NFS的设计都存在元数据瓶颈，庞大的元数据严重限制了它的命中率。解决方案是把数以十万计的图像聚集到单个Haystack存储文件中，从而消除了元数据负荷。
 references:
   - https://www.usenix.org/conference/osdi10/finding-needle-haystack-facebooks-photo-storage
   - https://www.facebook.com/notes/facebook-engineering/needle-in-a-haystack-efficient-storage-of-billions-of-photos/76191543919

diff --git a/zh-CN/126-how-to-stream-video-over-http.md b/zh-CN/126-how-to-stream-video-over-http.md
@@ -3,8 +3,9 @@ layout: post
 title: "如何使用HTTP协议向移动设备传输视频? HTTP Live Streaming (HLS)"
 date: 2019-01-14 18:58
 comments: true
-categories: interview
+categories: interview, system design
 language: zh-cn
+abstract: 使用HTTP直播流的移动视频播放服务有以下两个问题：手机的内存和外存有限;受制于不稳定的网络连接以及不同的带宽，需要在传输过程中动态调整传输视频的质量。我们可以通过服务器层面和客户端两个层面解决。
 references:
   - https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/StreamingMediaGuide/HTTPStreamingArchitecture/HTTPStreamingArchitecture.html#//apple_ref/doc/uid/TP40008332-CH101-SW2
 ---

diff --git a/zh-CN/127-ios-architecture-patterns-revisited.md b/zh-CN/127-ios-architecture-patterns-revisited.md
@@ -3,7 +3,7 @@ layout: post
 title: "再窥iOS架构模式"
 date: 2019-01-17 03:07
 comments: true
-categories: architecture, mobile
+categories: architecture, mobile, system design
 language: zh-cn
 references:
   - https://medium.com/ios-os-x-development/ios-architecture-patterns-ecba4c38de52

diff --git a/zh-CN/135-designing-uber.md b/zh-CN/135-designing-uber.md
@@ -4,6 +4,7 @@ title: "设计优步打车服务"
 date: 2019-02-08 22:18
 comments: true
 categories: system design
+abstract: 优步打车设计的要求：为全球的交通运输市场提供服务；大规模的实时调度；后端设计；优步打车设计流程：架构；微服务；调度服务；支付服务；用户档案服务和行程记录服务、通知推送服务。
 language: zh-cn
 references:
    - https://medium.com/yalantis-mobile/uber-underlying-technologies-and-how-it-actually-works-526f55b37c6f

diff --git a/zh-CN/138-stream-and-batch-processing.md b/zh-CN/138-stream-and-batch-processing.md
@@ -3,7 +3,7 @@ layout: post
 title: "流处理和批处理框架"
 date: 2019-02-27 02:20
 comments: true
-categories: architecture
+categories: architecture, system design
 language: zh-cn
 references:
   - https://storage.googleapis.com/pub-tools-public-publication-data/pdf/43864.pdf

diff --git a/zh-CN/151-introduction-to-architecture.md b/zh-CN/151-introduction-to-architecture.md
@@ -3,8 +3,9 @@ layout: post
 title: "构架入门"
 date: 2019-06-11 22:06
 comments: true
-categories: architecture
+categories: architecture, system design
 language: zh-CN
+abstract: 架构服务于软件系统的整个生命周期，使软件系统易于理解，开发，测试，部署和操作，其目标是最小化每个业务用例的人力资源成本。O’Reilly出版的《软件架构》介绍了五种基本架构：分层架构；事件驱动架构；微核架构；微服务架构；基于空间的架构。
 references:
   - https://puncsky.com/notes/10-thinking-software-architecture-as-physical-buildings
   - https://www.oreilly.com/library/view/software-architecture-patterns/9781491971437/ch01.html

diff --git a/zh-CN/176-lyft-marketing-automation-symphony.md b/zh-CN/176-lyft-marketing-automation-symphony.md
@@ -3,9 +3,10 @@ layout: post
 title: "Lyft 的营销自动化平台 Symphony"
 date: 2019-10-02 20:53
 comments: true
-categories: marketing, architecture
+categories: marketing, architecture, system design
 language: zh-CN
 slides: false
+abstract: 广告投放如何花更少的钱用更少的人得到更高回报？Lyft 的答案是自动化，包括LTV 预测模块 、预算分配模块、投放模块。当人从繁琐的投放任务解放出来，专注于理解用户、理解渠道、理解自身要传达给受众的信息之后，就能够获得更好的投放效果
 references:
   - https://eng.lyft.com/lyft-marketing-automation-b43b7b7537cc
 ---

diff --git a/zh-CN/18-soft-skills-interview.md b/zh-CN/18-soft-skills-interview.md
@@ -3,8 +3,9 @@ layout: post
 title: "软技能面试可以谈点什么？"
 date: 2018-08-21 16:43
 comments: true
-categories: interview
+categories: system design
 language: zh-cn
+abstract: 同等级技能下，不会表达自己，工作机会也会被抢走。面试的本质是三个问题：想干不能干；想干不想干；合拍不合拍。面试的五个谈话点：逆境；影响力；技术水平；合拍；成就。如何准备这五个谈话点：多与人交往，多尝试累积经验，多学技术，善于调研。
 references:
   - https://www.jianshu.com/p/73b1d5682fd3
   - https://www.amazon.com/dp/B01NAI5Q6H/

diff --git a/zh-CN/182-designing-l7-load-balancer.md b/zh-CN/182-designing-l7-load-balancer.md
diff --git a/zh-CN/183-designing-l7-load-balancer.md b/zh-CN/183-designing-l7-load-balancer.md
@@ -1,11 +1,11 @@
-
 ---
 layout: post
 title: "设计负载均衡器"
 date: 2019-10-19 15:21
 comments: true
 categories: system design
 language: zh-CN
+abstract: 互联网服务往往要处理来自全世界的流量，但是，一个服务器只能够同时服务有限数量的请求。因此，通常我们会有一个服务器集群来共同处理这些流量。那么问题来了，怎样才能够让这些流量均匀地分布到不同的服务器上呢？
 slides: false
 references:
   - https://blogs.dropbox.com/tech/2019/09/enhancing-bandaid-load-balancing-at-dropbox-by-leveraging-real-time-backend-server-load-information/

diff --git a/zh-CN/184-designing-i18n-solutions.md b/zh-CN/184-designing-i18n-solutions.md
@@ -3,6 +3,7 @@ layout: post
 title: 设计以人为本的国际化（i18n） 工程方案
 date: 2019-10-27 17:22
 comments: true
+abstract: 硅谷公司的产品大多面向全球市场，而国际化正是跨国公司征战全球市场的战略要地。我们这次设计的 i18n 工程方案主要是解决网站和移动 App 开发过程中的三大问题：1. 语言、2. 时间与时区、3. 数字与货币。如同一切软件系统的开发一样，国际化这件事情没有银弹，好的作品都是靠基本功一点一滴磨出来的。
 categories: system design
 language: zh-CN
 ---

diff --git a/zh-CN/37-key-value-cache.md b/zh-CN/37-key-value-cache.md
@@ -3,8 +3,9 @@ layout: post
 title: "键值缓存有哪些用法？"
 date: 2018-09-06 21:32
 comments: true
-categories: interview
+categories: system design
 language: zh-cn
+abstract: Key Value Cache的本质是为了减少访问数据的延迟。Cache设计的常见策略有read-through/write-through和cache aside.具体的策略要根据你的业务需求具体选择。
 references:
   - https://www.usenix.org/system/files/conference/nsdi13/nsdi13-final170_update.pdf
   - https://coolshell.cn/articles/17416.html

diff --git a/zh-CN/42-how-to-scale-a-web-service.md b/zh-CN/42-how-to-scale-a-web-service.md
@@ -3,8 +3,9 @@ layout: post
 title: "如何构建大规模的网站服务?"
 date: 2018-09-11 21:32
 comments: true
-categories: architecture
+categories: system design
 language: zh-cn
+abstract: 如何构建大规模的网站服务？一个字：拆。AKF扩展立方告诉了我们”拆”的三个纬度：水平扩展；业务拆分；数据分割。
 references:
   - https://akfpartners.com/growth-blog/scale-cube
   - https://akfpartners.com/growth-blog/akf-scale-cube-ze-case-for-z-axis