The number 5, for example, when viewed among the natural, or counting, numbers is one of those elemental creatures: a prime number, divisible only by 1 and itself.
比如数字5，在自然数或计数中，它是一个基本的数字：质数，只能被1或它自身整除。
The number 5, for example, when viewed among the natural, or counting, numbers is one of those elemental creatures: a prime number, divisible only by 1 and itself.
比如数字5，在自然数或计数中，它是一个基本的数字：质数，只能被1或它自身整除。
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