rational

理性的、理智的

She stayed rational even when everyone else started panicking.

就算其他人都開始慌了，她還是很理性。

合理的、合乎邏輯的

There must be a rational explanation for the missing money.

那筆不見的錢一定有合理的解釋。

有理性的、能思考的正式

Philosophers once defined humans as rational animals.

哲學家曾把人定義為有理性的動物。

有理的數學

Every integer can be written as a rational number.

每個整數都可以寫成有理數。

有理數數學

The square root of two is not a rational.

二的平方根不是有理數。