谢谢白云指出我的u发音有问题，嘴张开的不够大。听了你的NCE4，进步很大，听得清晰很多！我也要加倍多练习！

来源: beautifulwind 于 2021-05-02 19:50:08 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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