1. 普通話網

http://www.putonghuaweb.com/onlinedict/worddict.php

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2. 東東讀音小字典

http://www.kwuntung.net/chinese/

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3. 學好普通話

http://pth3e.ilongman.com/menuSe.html

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4. 北京普通話學會

http://www.beijingputonghua.com/learning/index.htm