本帖最后由 billzhao 于 2012-5-19 12:12 编辑 . M' X% t& {0 y+ ]# I. o; M
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好像南方或者北方有的地方s sh不分,下面视频应该有所帮助。: \8 i4 }9 |2 _+ [! H
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很喜欢老师的自信,她说 It's simple. It's easy. Once you watch this video, you get it, and you'll never make the mistake again. People will understand you, and your life will be fantastic. 3 D M5 u7 s* F- P) l+ u/ O' V. B: d) U5 }1 u3 o