在自然数的集合里，每个数字不是奇数就是偶数。

In the set of natural numbers, every number is either odd or even.

youdao

怎样判断一个数是不是奇数？

And how do you know if it is an odd number?

youdao

在自然数的集合里，每个数字不是奇数就是偶数，不存在一个偶数或多或少比另一个偶数更像偶数这样的情形。

In the set of natural Numbers, every number is either odd or even, and there is not one even number that is more or less even than any other even number.

youdao

It's not as though, oh, today is odd but maybe tomorrow it will be even.

并不是说，哦，今天它是奇数,也许明天就是偶数了。

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