名词
中文翻译：外层补数
同义词：
['outer pair', 'outer pairing']
例句：
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1. The outer layer of the skin is made up of dead cells.
皮肤的外层由死亡细胞组成。
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2. In mathematics, an outer complement can be used to solve equations involving complex numbers.
在数学中，可以使用外层补数来解涉及复数的方程。
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3. The outer complement of a number is the smallest positive integer that is not less than the number itself.
一个数的外层补数是最小的正整数，不小于该数本身。