rational

理性的、理智的

She stayed rational even when everyone else started panicking.

就算其他人都开始慌了，她还是很理性。

合理的、合乎逻辑的

There must be a rational explanation for the missing money.

那笔不见的钱一定有合理的解释。

有理性的、能思考的正式

Philosophers once defined humans as rational animals.

哲学家曾把人定义为有理性的动物。

有理的数学

Every integer can be written as a rational number.

每个整数都可以写成有理数。

有理数数学

The square root of two is not a rational.

二的平方根不是有理数。