- a cause, explanation, or justification for an action or event理由, 原因, 诱因：
the minister resigned for personal reasons
部长因个人原因辞职了
it is hard to know for the simple reason that few records survive.
仅仅因为记录少有幸存, 所以难于了解。
- mass noun good or obvious cause to do something充分理由：
we have reason to celebrate.
我们完全有理由庆祝一下。
- Logic a premise of an argument in support of a belief, especially a minor premise when given after the conclusion【逻】理由, 前提。
- mass noun the power of the mind to think, understand, and form judgements by a process of logic理智, 理性; 判断力, 推理力：
there is a close connection between reason and emotion.
理智与感情之间有紧密的联系。
- what is right, practical, or possible; common sense道理, 情理, 明智; 常识：
people are willing, within reason, to pay for schooling.
人们乐于付学费完全在情理之中。
one's reason
one's sanity正常神志：she is in danger of losing her reason.
她面临神志不清的危险。
- think, understand, and form judgements by a process of logic推论, 推理, 作逻辑推理：
humans do not reason entirely from facts
人类不完全根据事实进行推理
as noun reasoning the present chapter will outline the reasoning behind the review.这一章将对评论背后的推理进行概括。
- with obj.
reason something out
find an answer to a problem by considering various possible solutions推论出, 推断出; 讲出…的道理。
reason with
persuade (someone) with rational argument对（某人）以理相劝, 劝告：I tried to reason with her, but without success.
我努力劝导她, 但没有成功。
beyond (all) reason
- to a foolishly excessive degree毫无道理, 全然无理：
he indulged Andrew beyond all reason.
他毫无道理地纵容安德鲁。
by reason of
- formal because of〈正式〉因为, 由于：
persons who, by reason of age, are in need of care.
因年龄原因需要照顾的人。
for some reason
- used to convey that one doesn't know the reason for a particular state of affairs, often with the implication that one finds it strange or surprising不知什么原因, 不知何故：
for some reason he likes you.
不知为什么他喜欢你。
listen to reason
- be persuaded to act sensibly服从理智; 听取意见, 接受道理：
the child is usually too emotionally overwrought to listen to reason.
这孩子通常太受感情左右, 而不顾理智。
theirs （或ours） not to reason why
- used to suggest that it is not someone's (or one's) place to question a situation or system他们（或我们）无权过问。
- ORIGIN: with allusion to Tennyson's Charge of the Light Brigade (1854).
reason of state
- another term for RAISON D'ÉTAT.
(it) stands to reason
- it is obvious or logical合情理; 是当然的, 自不待言：
it stands to reason that if you can eradicate the fear the nervousness will subside.
如果你根除恐惧心理, 紧张感会随之减轻, 这是显而易见的事情。