必须的英文有：
necessary;
essential;
obligatory
扩展资料
加上必须的备课在内，我每天工作12个小时。
With all the lesson preparation I have to do I work 12 hours a day.
他们很可能只想干他们必须的所有打扫烟囱的危险工作，从中获取额外报酬。
Possibly they want danger money for all the chimney work they have to do.
非必须的.处罚只有在案件事实支持的情况下才应予以实施。
Where the penalties are not a must, they should be imposed only if the facts of a case support it.
标签：英文,几种,必须
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