(每日一词)rational

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Rational  /ˈræʃ.ən.əl/ adj. 头脑清醒的;理智的


1) 词根:rat- 计算,思考(词源同read, reason) 

2) 后缀:-ional 形容词后缀


e.g.There must be some rational explanation for what happened. 对发生的事一定有一个理性的解释。



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