(of behaviour, ideas, etc. 行为、思想等 based on reason rather than emotions 合理的；理性的；明智的 a rational argument/choice/decision 合理的论点／选择／决定 rational analysis/thought 有道理的分析／思考 There is no rational explanation for his actions. 对他的所作所为无法作出合理的解释。
Extra ExamplesIt all seemed quite rational to me. 在我看来这似乎全都合情合理。 With children working from the age of ten, large families were economically rational. 孩子从 10 岁就开始工作，多要几个孩子在经济上考虑是合乎情理的。 In some ways their behaviour is perfectly rational. 在某种程度上他们的行为完全合理。 She seems incapable of making a rational decision. 她似乎无法做出理性的决定。 We need to present them with a rational argument. 我们需要给他们一个理性的论证。
Oxford Collocations Dictionaryverbs- be
- seem
- highly
- very
- completely
- …
- about
(of a person 人 able to think clearly and make decisions based on reason rather than emotions 理智的；清醒的 No rational person would ever behave like that. 头脑清醒的人都不会这样做。 Try to be rational about it. 尽量理智地对待这件事。 Humans are essentially rational beings. 从本质上讲，人是理性动物。 She said that she had not been fully rational when she signed the form. 她说自己在表格上签字时并非完全头脑清醒。
Oxford Collocations Dictionaryverbs- be
- seem
- highly
- very
- completely
- …
- about
opposite irrational
Word Originlate Middle English (in the sense ‘having the ability to reason’): from Latin rationalis, from ratio(n-) ‘reckoning, reason’, from rat- ‘reckoned’, from the verb reri.