Know the difference between ordinal numbers and cardinal numbers.

对比基数词和序数词的不同.

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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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But what if arbitrarily divided regions of a rectangle are labeled with unique ordinal numbers?

但是,若将二维矩形平面任意分割成很多小的矩形区域,并以唯一的序号标记它们,情况会怎样 呢 ?

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