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VERB
敲；击
If you knock on something such as a door or window, you hit it, usually several times, to attract someone's attention.
例句
She went directly to Simon's apartment and knocked on the door...
她直奔西蒙的房间，敲了敲门。
Knock at my window at eight o'clock and I'll be ready...
8点钟敲我的窗，我会准备好的。
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VERB
碰，撞；（尤指）碰倒，撞倒，敲动
If you knock something, you touch or hit it roughly, especially so that it falls or moves.
例句
She accidentally knocked the tea tin off the shelf...
她不小心把架子上的茶叶罐碰了下来。
The baby was knocked from his father's arms...
婴儿被从他父亲的怀中撞落。
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VERB
打通（房间或建筑）
If someone knocks two rooms or buildings into one, or knocks them together, they make them form one room or building by removing a wall.
例句
They decided to knock the two rooms into one...
他们决定把两间屋子打通连成一间。
The spacious kitchen was achieved by knocking together three small rooms.
这个宽敞的厨房是由3个小屋子打通连成的。
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VERB
把…撞击到（某个位置）；把…打成（某种状态）
To knock someone into a particular position or condition means to hit them very hard so that they fall over or become unconscious.
例句
The third wave was so strong it knocked me backwards...
第3波浪太大了，把我打了回去。
They were knocked to the ground and robbed of their wallets...
他们被打倒在地并被抢走了钱包。
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VERB
使失去（某种品质或特征）
To knock a particular quality or characteristic out of someone means to make them lose it.
例句
The stories of his links with the actress had knocked the fun out of him...
有关他与那位女演员有关系的传闻使他很不开心。
When they first joined for training many were starry eyed about just sailing around the world. We soon knocked that out of them...
在他们参加培训之初，很多人还只是对环球航行抱有天真的想法。我们很快便使他们消除了那种想法。
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VERB
发碰撞声；砰砰作响
If something knocks, it makes a repeated sharp banging noise.
例句
His old truck, knocking and smoking, pulled down the road and out of sight.
他那辆旧卡车一边冒着烟一边哐里哐啷地沿路向前驶去，直到驶出了视线。
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VERB
批评；贬责；挑剔；非难
If you knock something or someone, you criticize them and say unpleasant things about them.
例句
I'm not knocking them: if they want to do it, it's up to them...
我不是批评他们：想不想做那件事取决于他们。
Never knock charter flights; they are opening up the world for budget-conscious travellers.
绝不要挑剔包机航班；他们使精打细算的乘客能够去往世界各地。
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N-COUNT
打击
If someone receives a knock, they have an unpleasant experience which prevents them from achieving something or which causes them to change their attitudes or plans.
例句
What they said was a real knock to my self-confidence...
他们的话是对我自信心的一次重大打击。
The art market has suffered some severe knocks during the past two years.
在过去的两年间，艺术品市场遭受了严重的打击。
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PHRASE
（尤指以相貌）给…留下深刻印象，使…倾倒
To knock them dead means to impress people a great deal, especially with your appearance.
例句
Glamorous make-up is best reserved for days when you want to go all out to knock 'em dead.
魅惑彩妆最好留到你竭力想把所有人都迷倒的时候。
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PHRASE
停止干扰;打住
If you tell someone to knock it off, you are telling them to stop doing something that is annoying you.
例句
Will you just knock it off!
别闹了！