diff --git a/pypinyin/utils.py b/pypinyin/utils.py
index e7e3612..a3e3f30 100644
--- a/pypinyin/utils.py
+++ b/pypinyin/utils.py
@@ -4,6 +4,12 @@
 
 # 用于向后兼容，TODO: 废弃
 from pypinyin.seg.simpleseg import simple_seg  # noqa
+from pypinyin.style._tone_convert import tone2_to_tone
+
+
+# 用于向后兼容，TODO: 废弃
+def _replace_tone2_style_dict_to_default(string):
+    return tone2_to_tone(string)
 
 
 def _remove_dup_items(lst, remove_empty=False):
diff --git a/pypinyin/utils.pyi b/pypinyin/utils.pyi
index a7f8ddf..a6b2efc 100644
--- a/pypinyin/utils.pyi
+++ b/pypinyin/utils.pyi
@@ -1,5 +1,9 @@
 from typing import List, Text
 
+
+def _replace_tone2_style_dict_to_default(string: Text) -> Text: ...
+
+
 def _remove_dup_items(lst: List[Text]) -> List[Text]: ...
 
 
diff --git a/tests/contrib/test_tone_sandhi.py b/tests/contrib/test_tone_sandhi.py
index 2aaa9b7..fe103f0 100644
--- a/tests/contrib/test_tone_sandhi.py
+++ b/tests/contrib/test_tone_sandhi.py
@@ -50,10 +50,16 @@ class MyConverter(ToneSandhiMixin, DefaultConverter):
     # 不满足变调条件
     [['之一'], ['zhi1', 'yi1'], ['zhi1', 'yi1']],
     [['一'], ['yi1'], ['yi1']],
+
+    # #270
+    [['永远'], ['yo3ng', 'yua3n'], ['yo2ng', 'yua3n']],
+    [['两手'], ['lia3ng', 'sho3u'], ['lia2ng', 'sho3u']],
+    [['辗转反侧'], ['zha3n', 'zhua3n', 'fa3n', 'ce4'],
+     ['zha3n', 'zhua3n', 'fa3n', 'ce4']],
 ])
 def test_tone_sandhi(han, normal_output, sandhi_output):
     assert lazy_pinyin(han, style=Style.TONE2) == normal_output or \
-           lazy_pinyin(han, style=Style.TONE2) == sandhi_output
+            lazy_pinyin(han, style=Style.TONE2) == sandhi_output
 
     assert my_pinyin.lazy_pinyin(han, style=Style.TONE2) == sandhi_output
     # 测试关键字参数