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该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
由阿拉伯数字1表示的数字；等于该基数的数值
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由阿拉伯数字1表示的数字；等于该基数的数值；自然数集中第一个正数；最小非空集合的基数；没有前驱的元素的序数,通常称为第一或一号；一
The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
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由阿拉伯数字1表示的数字；等于该基数的数值
The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
自然数集中第一个正数
The first positive number in the set of natural numbers.
最小非空集合的基数
The cardinality of the smallest nonempty set.
没有前驱的元素的序数,通常称为第一或一号
The ordinality of an element which has no predecessor, usually called first or number one.
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该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
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