5个前鼻韵母https://v.qq.com/txp/iframe/player.html?vid=m0501rjp6m5&width=500&height=375&auto=0
4个后鼻韵母
https://v.qq.com/txp/iframe/player.html?vid=m0501wtthjt&width=500&height=375&auto=0
视频来源 腾讯视频
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