Translate one sentence.

11s-advanced-reactivity.md.erb

@@ -90,7 +90,7 @@ Meteor.setInterval(function() {
 meteor add reactive-var
 ~~~
 
-The we can use it to simplify our code a bit:
+使用它可使我们的代码简化一点：
 
 ~~~js
 var currentLikeCount = new ReactiveVar();