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“一言为定”，汉语成语，意思是一句话说定了，不再更改。比喻说话算数，决不反悔。可以翻译为“that’s settled then，a promise is a promise或that’s a deal”。
例句：
好，就这样办，一言为定。
All right, that’s the way to do it. It’s settled then.
一言为定，决不反悔。I give you my word and I'll never go back on it.
Editor: Jade
来源：chinadaily.com.cn
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