the offer must be certain
The offer must be certain 要约的内容必须确定 A vague offer can be made certain by referring to the previous dealing.
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the offer must be certain
报价必须是确定的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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These reasons just offer certain possibility for producing new meaning of old word, The forming of new meaning must be realized through the concrete production way.
这些原因只是为旧词产生新义提供了一定的可能性，新义的形成必须通过具体的产生方式来实现。
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