) [4 \$ v% M2 X( t) K, c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。6 A' l4 ?# o- q9 o7 [4 A. s
5 V% s+ d& i: K9 X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. ; l- \: }7 E3 F% [: u4 j9 P % T" h5 `! A. e, n. t0 u6 x1 u" R4 E. b( [& w7 N# a r: s0 ~