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充分又必要条件
释义
充分又必要条件
chōng fèn yòu bì yào tiáo jiàn
如果有甲必有乙，无甲必无乙，那么甲就是乙的充分又必要条件。例如，三角形是等角的，则三角形是等边的，而只有三角形是等角的，三角形才是等边的。因此，三角形等角就是三角形等边的充分又必要条件。
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The Devil Came on Horseback
the devil/hell to pay
the devil incarnate
The devil in the belfry
The Devil in the Dark
The Devil Is a Woman
the devil is good when he is pleased
The devil is good when he is pleased
the devil is in the detail
the devil is not so black as he is painted
The devil is not so black as he is painted
The devil is said to tempt people to do wrong
The devil is subtle
The devil is subtle,yet weaves a web
The devil is subtle, yet weaves a web
The devil jumps with glee
the devil knows many things because he is old
The devil knows many things because he is old
the devil looks after his own
The devil makes work for idle hands
The devil make work for idle hands
The devil never sleeps
the devil of a
the devil of it
The Devil of the Sea
英汉汉英双解词典包含9999994条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。
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更新时间：2025/7/17 8:30:23