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(1)(能)推理的(having or using the ability to reason)：Man is a～animal. 人類是理性動(dòng)物。Are men more～than women? 男人是不是比女人更有理性?

(2)講(合)理的，有理智的(reasonable;sensible;not influenced by emotion)：a～explanation/plan/suggestion 一個(gè)合理的解釋/計(jì)劃/建議;Her behaviour isn't～. 她的行為不理智。Panic destroys～thought. 驚恐使人喪失理智?！纪絩easonable;

(3)頭腦清楚(健康)的(of sound mind)：A～man wouldn't do things like that. 一個(gè)頭腦正常的人不會(huì)干那樣的事。The old man was perfectly～when he made out his will. 那位老人立遺囑時(shí)頭腦很清楚?！纪絪ound;〖反〗 irrational;

【辨異】rational與reasonable都表示“講道理，有推理能力”。 rational表示比較抽象、純理性地推理，如：Her conclusions are always of a rational，never an emotional nature.(她的結(jié)論總是很理性的，從來(lái)不帶感情色彩。)reasonable(合情理的)表示簡(jiǎn)單實(shí)際地推理，如：A reasonable supposition is one that appeals to our common sense.(所謂合理的推測(cè)就是迎合常識(shí)的推測(cè)。)