名词
中文翻译：弱界集
同义词：
['weakly closed set', 'weakly compact set']
例句：
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1.The image of the sun is a weakly bounded set in the solar system.
太阳的形象是一个太阳系中的弱界集。
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2.In mathematics, a weakly bounded set is a subset that is not necessarily closed.
在数学中，弱界集是一组不必然封闭的子集。
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3.The weakly bounded set contains all prime numbers less than 100.
这个弱界集包含了所有小于100的素数。