名词
中文翻译：可数无限子集
同义词：
['countable infinite subset', 'countably infinite set']
例句：
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1. In mathematics, a countably infinite subset is a subset of a set that can be expressed as a countable set.
在数学中，一个可数无限子集是集合的一个子集，它可以表示为一个可数集合。
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2.The countably infinite subset of the set {1, 2, 3} is {1, 2}.
集合{1, 2, 3}的可数无限子集是{1, 2}。
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3.The countably infinite subset of the set {1, 2, 3, 4} is {1, 2}.
集合{1, 2, 3, 4}的可数无限子集是{1, 2}。