Suppose D is a positive integer with square free.
设d是无平方因子正整数。
Length is a positive integer number that does not exceed 106.
一个正整数号码长度不超过106。
Mathematical induction is a positive integer proved extremely relevant to the topic of effective scientific methods.
数学归纳法是一种证明与正整数有关的命题的极为有效的科学方法。
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