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N-COUNT
刀
A knife is a tool for cutting or a weapon and consists of a flat piece of metal with a sharp edge on the end of a handle.
例句
...a knife and fork...
一副刀叉
Two robbers broke into her home, held a knife to her throat and stole her savings.
兩個盜賊闖進了她的家，把刀架在她的脖子上，搶走了她的積蓄。
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VERB
用刀傷害
To knife someone means to attack and injure them with a knife.
例句
Dawson takes revenge on the man by knifing him to death...
道森用刀殺死了他的仇人。
She was knifed in the back six times.
她的背部中了6刀。
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N-COUNT
手術刀
A surgeon's knife is a piece of equipment used to cut flesh and organs during operations. It is made of metal and has a very thin sharp edge.
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PHRASE
接受手術；動手術
If you go under the knife, you have an operation in a hospital.
例句
Kelly was about to go under the knife when her surgeon stopped everything.
凱莉的手術就要開始時被她的外科醫生給叫停了。
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PHRASE
輕而易舉；毫無困難
If someone does something like a knife through butter or like a hot knife through butter, they do it very easily.
例句
Spending by Japanese companies has left them more competitive than companies in other nations. They will be cutting through the competition like a hot knife through butter.
日本公司的支出使得它們比其他國家的公司更具競爭力。它們將在競爭中輕而易舉地取勝。
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PHRASE
（緊張的氣氛）使人透不過氣來
If you have been in a place where there was a very tense atmosphere, you can say that you could have cut the atmosphere with a knife.
例句
Officials hung the flag upside down. You could have cut the atmosphere with a knife.
官員們把旗子掛倒了。氣氛緊張得讓人透不過氣來。
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PHRASE
對…磨刀霍霍；對…興師問罪
If a lot of people want something unpleasant to happen to someone, for example if they want them to lose their job, you can say that the knives are out for that person.
例句
The Party knives are out for the leader.
該黨派要向其領導人開刀了。
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PHRASE
落井下石；往傷口上撒鹽
If you twist the knife or if you turn the knife in someone's wound, you do or say something to make an unpleasant situation they are in even more unpleasant.
例句
Travis twisted the knife by laughing at her...
特拉維斯火上澆油般地嘲笑她。
It is the turn of Latvia to twist the knife.
輪到拉特維亞落井下石了。