词典释义：
序数；序号；述序数
There are two main types of numbers in math: cardinal numbers and ordinal numbers.
数学中有两种主要的数字类型：基数和序数。
Know the difference between ordinal numbers and cardinal numbers.
对比基数词和序数词的不同.
Know how to distinguish and use ordinal numbers and cardinal numbers.
掌握基数词和序数词的用法.
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