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VERB
允许，任由，让（某事发生）
If you let something happen, you allow it to happen without doing anything to stop or prevent it.
例句
People said we were interfering with nature, and that we should just let the animals die...
人们说我们是在干涉自然界，还说我们应该任由动物死去。
Thorne let him talk...
索恩让他畅所欲言。
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VERB
允许，准许，同意（某人做某事）
If you let someone do something, you give them your permission to do it.
例句
I love sweets but Mum doesn't let me have them very often...
我爱吃糖，可妈妈不让我常吃。
The Americans won't let her leave the country...
美国人不允许她出境。
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VERB
（开门、让路等）允许（…进、出或通过）
If you let someone into, out of, or through a place, you allow them to enter, leave, or go through it, for example by opening a door or making room for them.
例句
I had to get up at seven o'clock this morning to let them into the building because they had lost their keys...
今天早上我不得不7点钟就起床开门让他们进楼，因为他们把钥匙弄丢了。
I let myself into the flat...
我自己开门进了公寓。
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VERB
（用于引出要说的话）让我，我来
You use let me when you are introducing something you want to say.
例句
Let me say it again. I despised Wade's life...
我再说一遍。我厌恶韦德的生活方式。
Let me tell you what I saw last night...
我来告诉你我昨晚见到了什么。
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VERB
（用于礼貌地表示愿意提供帮助）让我，我来
You use let me when you are offering politely to do something.
例句
Let me take your coat...
我来帮您拿外套。
Let me get you something to drink.
我给你拿杯喝的来。
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VERB
（用于将他人的注意力引向下面的话题）让我们
You say let's or, in more formal English, let us, to direct the attention of the people you are talking to towards the subject that you want to consider next.
例句
Let's consider ways of making it easier...
咱们来想想办法把它变得更容易些吧。
Let us look at these views in more detail.
我们来具体研究一下这些观点。
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VERB
（用于提出建议或表示赞同）让我们
You say let's or, in formal English, let us, when you are making a suggestion that involves both you and the person you are talking to, or when you are agreeing to a suggestion of this kind.
例句
I'm bored. Let's go home...
我觉得好无聊。我们回家吧。
'Shall we go in and have some supper?' — 'Yes, let's.'
“我们要不要进去吃点晚饭？”——“好啊，走吧。”
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VERB
（用于委婉地发出指令）让我们
Someone in authority, such as a teacher, can use let's or, in more formal English, let us, in order to give a polite instruction to another person or group of people.
例句
Let's have some hush, please...
请大家安静一下。
'Let us pray,' said the Methodist chaplain.
“我们来祈祷吧，”那个循道宗牧师说。
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VERB
（表示犹豫或思考）让我看看/让我想想
People often use let in expressions such as let me see or let me think when they are hesitating or thinking of what to say next.
例句
Now, let's see. Where did I leave my bag?...
嗯，我想想。我把包放哪儿了？
'How long you been living together then?' — 'Erm, let me think. It's about four years now.'
“那你们住在一起有多久了？”——“呃，我想想。到现在差不多4年了。”
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VERB
（表示不关心）任由，让，随
You can use let to say that you do not care if someone does something, although you think it is unpleasant or wrong.
例句
If he wants to do that, let him do it...
他要做，就让他做好了。
Let them talk about me; I'll be dead, anyway...
随他们怎么说我吧；我反正是要死的。
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VERB
（表示认为某人应该做某事）让
You can use let when you are saying what you think someone should do, usually when they are behaving in a way that you think is unreasonable or wrong.
例句
Let him get his own cup of tea...
自己的茶让他自己端。
If they value these data, let them pay for them.
他们要是看重这些数据，就让他们出钱买。
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VERB
（表示祈祷或盼望）让
You can use let when you are praying or hoping very much that something will happen.
例句
Please God, let him telephone me.
上帝啊，求你让他打电话给我吧。
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VERB
假设；假定；如果
You can use let to introduce an assumption on which you are going to base a theory, calculation, or story.
例句
Let x equal 5 and y equal 3...
设x等于5，y等于3。
The new man in my life (let's call him Dave) had a very jealous ex-girlfriend.
我生命中这个新男人（就叫他戴夫吧），他的前女友是个醋坛子。
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VERB
出租（房屋、土地等）
If you let your house or land to someone, you allow them to use it in exchange for money that they pay you regularly.
例句
She is thinking of letting her house to an American serviceman...
她正考虑把房子租给一个美国军人。
The reasons for letting a house, or part of one, are varied.
把整套房子或其中一部分租出去，其原因是多种多样的。
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N-COUNT
（网球或羽毛球发球时的）擦网球，触网重发
In tennis or badminton, if you serve a let, the ball or shuttlecock touches the net but lands in the correct part of the court. You then serve again.
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PHR-CONJ-COORD
（通常用在否定句后）遑论，更别提，更不用说
Let alone is used after a statement, usually a negative one, to indicate that the statement is even more true of the person, thing, or situation that you are going to mention next.
例句
It is incredible that the 12-year-old managed to even reach the pedals, let alone drive the car.
12岁的孩子能踩到踏板已经是不可思议，就更不用说开车了。
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PHRASE
不打扰；不干涉
To let someone be means to leave them alone and not interfere in what they are doing.
例句
If your child is really sick and needs sleep and quiet, let him be.
如果孩子真的病了，需要睡眠和静养的话，就不要去打扰他。
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PHRASE
松开；放开
If you let go of someone or something, you stop holding them.
例句
She let go of Mona's hand and took a sip of her drink...
她放开莫娜的手，抿了一口饮料。
She held the photos with the determined grip of a small child and wouldn't let go.
她像小孩一样紧紧攥住那些照片，不肯放手。
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PHRASE
放弃，舍弃（感情、态度、控制权）
If you let go of a feeling, attitude, or the control that you have over something, you accept that you should give it up or that it should no longer influence you.
例句
In therapy, she began to let go of her obsession with Mike...
在心理治疗中，她开始逐渐放下对麦克的痴迷。
The work should focus on helping parents to let go of their children.
工作应以协助父母放松对子女的管教为重点。
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PHRASE
放走；释放；让…逃走
If you let someone or something go, you allow them to leave or escape.
例句
They held him for three hours and they let him go...
他们扣留了他3个小时后放走了他。
I'm quite happy really to net a fish and then let it go.
网到鱼后又把它放生，我挺开心的。
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PHRASE
解雇；解聘；让…离职
When someone leaves a job, either because they are told to or because they want to, the employer sometimes says that they are letting that person go .
例句
I've assured him I have no plans to let him go...
我向他保证，我绝对没打算让他走人。
Peterson was let go after less than two years.
不到两年彼得森就被解雇了。
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PHRASE
不予理会；不予追究
If someone says or does something that you think is annoying or stupid and you let it go, you do not react to it or say anything about it.
例句
Let it go, he thought. He didn't feel like arguing.
管它呢，他想。他并不想争吵。
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PHRASE
放松；随心所欲
If you let yourself go, you relax and behave much more freely than usual.
例句
Stop worrying about what you're feeling. Let yourself go.
不要总想着自己是什么感觉。放轻松点。
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PHRASE
不修边幅；不注意仪表
If someone lets themselves go, they pay less attention to themselves or their appearance than they used to, so that they look untidy or unattractive.
例句
If you have let yourself go, you should consider doing something about it for the sake of your health.
你以前要是对自己不管不顾，现在应该为了自己的健康着想而改变一下。
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PHRASE
(使自己)陷入，卷入，招惹（麻烦等）
If you say that you did not know what you were letting yourself in for when you decided to do something, you mean you did not realize how difficult, unpleasant, or expensive it was going to be.
例句
He got the impression that Miss Hawes had no idea of what she was letting herself in for...
他觉得霍斯小姐根本不知道自己会惹来什么麻烦。
I realized I'd let myself in for something from which there was no turning back.
我意识到自己陷入了没有退路的境地。
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PHRASE
告知；告诉；使知情
If you let someone know something, you tell them about it or make sure that they know about it.
例句
They want to let them know that they are safe...
他们想让他们知道他们安全无事。
If you do want to go, please let me know.
如果你真想去的话就请告诉我。
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PHRASE
泄露；无意中吐露
If you let drop ,let fall, or let slip information, you reveal it casually or by accident, during a conversation about something else.
例句
How could she know about that? He'd certainly never let drop any hint...
她是怎么知道的？他绝对没有走漏半点风声。
He might have let something slip in a moment of weakness.
他可能一时大意说漏了嘴。
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PHRASE
放任；给予完全的自由
If you say that someone has been let loose in a place or situation, you mean that they have been given complete freedom to do what they like in that place or situation, and you suggest that this may be risky.
例句
She has all the glee of a little girl let loose in a sweetie shop...
她像糖果店里无人管束的小女孩那样兴高采烈。
Trainees go through a four-hour lesson before they are let loose on the controls.
受训人员须上4小时的课才能自由进行操作。
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PHRASE
（常指地）发（声），讲（话）
If someone lets loose a sound or remark, they make it, often suddenly.
例句
He let loose a long, deep sigh...
他突然喟然长叹了一声。
Hill let loose a torrent of abuse against those who prosecuted his case.
希尔对控告他的人破口大骂起来。
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PHRASAL VERB
使美中不足；使差强人意；使不理想
If something lets you down, it is the reason you are not as successful as you could have been.
例句
Many believe it was his shyness and insecurity which let him down...
很多人认为是他的腼腆和缺乏安全感拖了他的后腿。
Sadly, the film is let down by an excessively simple plot.
遗憾的是，过于简单的情节使得这部电影差强人意。
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PHRASAL VERB
给（轮胎等）放气
If you let down something such as a tyre, you allow air to escape from it.
例句
I let the tyres down on his car...
我把他的汽车轮胎放了气。
Remove wheelnuts, let down tyre, put on spare.
拧下车轮螺母，放掉车胎的气，换上备用胎。