rea·son1 /ˈriːzən/ ●●● S1 W1 noun 1 cause 原因 [countableC]REASON why something happens, or why someone does something 原因，理由 reason for People give different reasons for wanting to change jobs.
reason why We’d like to know the reason why she didn’t accept the job.
reason (that) The reason I called was to ask about the plans for Saturday.
reason behind He explained the reasons behind the decision.
for reasons of something The bridge is closed for reasons of safety.
reason to do something This work gives me a reason to live.
there is no reason to do something 没有理由惊慌。 There is no reason whatsoever to doubt her story.
by reason of something formal (=because of something) 因为某事 a person disqualified by reason of age
2 good or fair 好的或合理的 [uncountableU]RIGHT/JUSTIFIED a fact that makes it right or fair for someone to do something 〔正确或合理的〕理由 (no) reason to do something There is no reason to panic.
She has reason to feel guilty.
We have reason to believe that the goods were stolen.
I know I’m late, but that’s no reason to shout at me.
Under the circumstances, we had every reason (=had very good reasons) to be suspicious.
with (good) reason (=based on something sensible) 有（充分的）理由 Natalie was alarmed by the news, and with reason.
3 all the more reason why/to do something spokenREASON used to say that what has just been mentioned is an additional reason for doing what you have suggested 更有理由做某事 But surely that’s all the more reason to act quickly.
4 good judgment 良好的判断力 [uncountableU]SENSIBLE sensible judgment and understanding 道理，情理 SYN sense There’s reason in what he says.
They’re not prepared to listen to reason (=be persuaded by someone’s sensible advice).
There’s no way of making my grandfather see reason (=accept advice and make a sensible decision).
5 within reason SENSIBLEwithin sensible limits 合情合理 You can go anywhere you want, within reason.
within reason• Within reason, the city does what it can to prevent traffic accidents.• Do what you can, within reason, to prevent accidents.• The management often let their regulars stay on credit, within reason.• So it follows that the more startling or bizarre your murder is, within reason, the better.• Clearly a public service campaign must, within reason, aim for virtually complete coverage.• By all means go and practise within reason.• Children should, within reason, be able to experiment with many different activities.• Where you take them should, within reason, be left entirely to them.• In fact, it's quite useful to expose him to people from outside the Unit, within reason.• It is well within reason to expect help in this regard in exchange for further financial assistance.• They are also willing, within reason, to pay towards this schooling. 6 go/be beyond (all) reason WRONG/UNJUSTIFIEDto be more than is acceptable or reasonable 不合理 Their demands go beyond all reason.
go/be beyond (all) reason• Their demands go beyond all reason.• But by this time Maidstone was beyond all reason.• He is beyond reason, Diniz.• It was beyond all reason that Hal, who had performed flawlessly for so long, should suddenly turn assassin.• Their condition is beyond reason, but it is certainly not, as they believe, beyond cure. 7 ability to think 思考能力 [uncountableU]INTELLIGENT the ability to think, understand, and form judgments that are based on facts 思考能力；判断力，理智 the human power of reason
lose your reason old-fashioned (=become mentally ill) 失去理智；患精神病
8 no reason spokenNONE/NOTHING used when someone asks you why you are doing something and you do not want to tell them 不为什么〔用于不想解释自己做某事的原因〕 → no rhyme or reason at rhyme1(4), → it stands to reason at stand1(32) ‘Why d’you want to go that way?‘ ’Oh, no reason.'
no reason• I wake up during the night for no reason. 7.• There is no reason to be fatalistic.• There is no reason why a policeman should not be regarded as the victim of this conduct.• ``Why do you want to go that way?'' ``Oh, no reason.''• There's no reason why it shouldn't have worked.• There s no reason whatsoever we shouldn't be thinking in terms of the championship anyway.• I see no reason why they should not be.• But there was no reason why she shouldn't enjoy a bit of company for the rest of the journey.• There was no reason for this other than a certain unwillingness to emerge from our bond trading shell. n GRAMMAR: Comparison reason
You say the reason for
What do you think was the reason for their success? ✗
Don’t say: the reason of their success
You say the reason why
Can you tell me the reason why you did this?
You say the cause of
There will be a police investigation into the cause of the fire. ✗
Don’t say: the cause for the fire
You say there is cause for concern/alarm/complaint/worry etc
The doctor said there was no cause for concern.
COLLOCATIONS verbs have a reason 有理由 We had many reasons to celebrate.
give a reason 说明原因 No reason was given for the change.
think of a reason/see a reason 想出/知道原因 I see no reason why it shouldn’t work.
nI can’t think of any reason why she would want to leave.
explain the reasons for something 解释做某事的原因adjectives Explain the reasons for your choice.
a good reason 充分理由 There is usually a good reason why the price is so cheap.
the main reason 主要理由 The main reason for the decline in the railways is lack of investment.
a major reason (also a big reason informal) 重要原因 His personality was a major reason for his success.
nA big reason for the decrease in smoking is the ban on cigarette advertising.
the real reason 真正原因 What do you think was the real reason for their decision?
a valid/legitimate reason (=a good and acceptable reason) 合理/正当理由 An employer can’t fire someone without a valid reason.
a compelling reason (=a very good reason for doing something) 令人信服的理由
nThere are compelling reasons to believe that this is true.
a simple reason (=one that is easy to understand) 简单的理由
nI hate mobile phones, for the simple reason that it is now impossible to get away from them.
a logical reason 合乎情理的理由
nPeople don’t always have logical reasons for the things they do.
the only reason 唯一的理由phrases
nThe only reason he’s coming tonight is that I said you’d be here.
for legal/political/medical etc reasons 出于法律上/政治上/医学上等的原因 The boy cannot be named for legal reasons.
for security reasons 出于安全原因 The road will be closed for security reasons.
for personal reasons 出于个人原因 He resigned for personal reasons.
for sentimental reasons (=because you like someone or something very much) 出于感情上的原因
nI wanted to keep the picture for sentimental reasons.
for obvious reasons 出于明显的原因
nThis arrangement must be kept secret, for obvious reasons.
for no apparent reason (=for no obvious reason) 无明显的原因
nHe tried to kill me for no apparent reason.
for some reason (or other) (also for some unknown reason) (=for a reason that you do not know) 出于某种原因
nFor some reason she felt like crying.
nFor some unknown reason, the curtains were always drawn.
for reasons best known to somebody (=used when you do not understand someone’s behaviour) 原因只有某人知道
nFor reasons best known to herself, she decided to sell the house.
have your reasons (=have a secret reason for doing something) 自有原因
n‘Why did he marry her?’ ‘He must have had his reasons.’
THESAURUS reason why something happens, or why someone does something 原因，理由 What was the reason for the delay?
I don’t know the reason why he left his last job.
ncause the reason why something happens, especially something bad
What was the cause of his death?
We studied the causes of the First World War.
explanation a set of reasons that helps you to understand why something happens, especially when it seems difficult to understand 〔尤对难以理解的事情的〕解释 There are various possible explanations for climate change.
Is there any explanation for his behavior?
motive a reason that makes someone decide to do something – often used about crimes 〔常指犯罪的〕动机 Police say that there is no obvious motive for the attack.
justification a good reason for doing something that seems wrong 〔做似乎错误的事情的〕正当理由 There is never any justification for torture or abuse.
They try to use the situation in the Middle East as a justification for killing innocent civilians.
nThere’s no justification for this type of behaviour.
grounds a reason that makes it right or fair to do something, especially according to legal, official, or moral rules 〔尤指依照法律、规章或道德准则的〕充分理由，根据 The court will decide if she has grounds for divorce.
They claim the war is justified on moral grounds (=because of moral reasons).
basis the main ideas or reasons on which something is based 基础；根据 The doctor makes his decisions purely on the basis of clinical observation.
What do you think is the basis for this advice?
rationale /ˌræʃəˈnɑːl $ -ˈnæl/ formal a set of reasons that are used to explain why someone does something in a particular way 〔用于解释某个行为的〕理由a reason that does not seem believable 不可信的理由 the rationale behind the government’s economic reforms
nThis chapter explains the nature of yearly plans, and provides a rationale for their use.
excuse a reason that you give to explain why you have done something bad, or not done something that you should have done – especially one that is not completely true 〔尤指不完全真实的〕托词，借口 She said she couldn’t come because she had to work late, but it was just an excuse.
a feeble excuse (=one that is hard to believe)
pretext especially written an untrue reason that you give for doing or not doing something, in order to hide the real reason 〔意在掩盖真实原因的〕借口 He would often find some pretext to go out in the evening alone.
They used this as a pretext for taking military action.