I am wondering what's the different between "chinese" and "mandarin"
Why you called it mandarin but not chinese like "japanese"

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'Mandarin'总是是普通话。
'Chinese'是在中国里的方言。它可能是普通话, 广东话, 四川话, 上海话 等等。
我们说'Chinese'的时候,  大多数的时间我们的意思是普通话 (有的时是广东话),  但是如果我们不知道中国人在什么方言里聊, 我们就说他们说Chinese。

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Mandarin is officially used and accepted.

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There are alot of different dialects within the Chinese language. The most common is Mandarin (the widely spoken in china)

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