MEANING/意义
必要
EXAMPLES/列句
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在必要的情况下if necessary,under necessary circumstances
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没有必要把它说出去。It's not necessary to speak it out.
COMBINATIONS/组合
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必要性necessity
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有必要there is necessity, (it) is necessary
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没必要not necessary,no necessity
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必要条件requirement,necessary condition (math)