We use natural numbers for the room numbers as well as the seat numbers on the buses.

我们使用自然数为房间号，同时也是大巴的座位号。

The first two aren't very interesting: all ones, and then the positive integers, also known as natural numbers.

开头两条并不是很有趣，全都是 1。接下来是正整数，也被称为自然数。

Any intelligent species might have an interest in natural numbers (1, 2, 3 and so on) as well as things such as pi.

任何聪明的物种都可能对自然数(1、2、3等等)和圆周率之类的东西感兴趣。