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本帖最后由 billzhao 于 2012-5-19 12:12 编辑 / m9 t3 S' H9 R n8 o" V! V
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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。( ^, Y6 P$ ~: `2 c
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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.5 `8 ^& _3 c1 p0 X( V. b
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