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用英语写出下列数词以及它们的序数词21

发表时间：2024-10-16 22:18:16 来源：网友投稿

In English, the number 21 is written as twenty-one. The cardinal number, which is used to count items, remains the same as the ordinal number, which indicates position or order. Therefore, the ordinal form of 21 is also twenty-first. The word twenty comes from the Old English twentig, derived from the Proto-Germanic root *twentjōn, which means two tens. The suffix -one in the ordinal form is used to denote the first item in a series. For example, if you have three items and you want to specify that the second item is twenty-one in order, you would say the twenty-first item. It's important to note that in English, the ordinal form is not always required, especially in casual conversation, but it is necessary when clarity is needed, such as in lists, rankings, or in referring to specific positions in a sequence.

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