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N-COUNT
狗;犬
A dog is a very common four-legged animal that is often kept by people as a pet or to guard or hunt. There are many different breeds of dog.
例句
Outside, a dog was barking...
外面，一只狗在叫。
The dog growled again...
狗又在狂吠。
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N-COUNT
公狗;犬科雄兽(雄狐、雄狼等)
You use dog to refer to a male dog, or to the male of some related species such as wolves or foxes.
例句
Is this a dog or a bitch?
这是公狗还是母狗?
...a dog fox.
公狐狸
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N-COUNT
卑鄙小人;无赖
If someone calls a man a dog, they strongly disapprove of him.
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N-COUNT
蹩脚货;粗制滥造的东西
People use dog to refer to something that they consider unsatisfactory or of poor quality.
例句
It's a real dog.
这实在是蹩脚货。
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N-COUNT
丑女人
If someone, especially a man, calls a woman or girl a dog, they mean that she is very ugly, unattractive, or boring.
例句
How can you go out with her? She's a real dog.
你怎么能和她谈恋爱呢？她简直就是个恐龙。
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VERB
困扰;折磨;纠缠
If problems or injuries dog you, they are with you all the time.
例句
The problems that have dogged him all year are just a temporary setback...
一时的挫折竟困扰了他一整年。
His career has been dogged by bad luck.
他在事业上一直不走运。
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N-PLURAL
（带有赌博性质的）赛狗会，跑狗
The dogs is a sports meeting where dogs, especially greyhounds, race and people bet on which dog will win.
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PHRASE
乱七八糟;一团糟
You describe something as a dog's breakfast or dog's dinner in order to express your disapproval of it, for example because it is very untidy, badly organized, or badly done.
例句
The whole place was a bit of a dog's dinner, really...
整个地方乌烟瘴气的，真的。
Our own Board are going to make a dog's breakfast out of it if we aren't careful.
如果我们不小心行事，我们的董事会就会乱成一团。
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PHRASE
狗咬狗;残酷无情的竞争;自相残杀
You use dog eat dog to express your disapproval of a situation where everyone wants to succeed and is willing to harm other people in order to do so.
例句
It is very much dog eat dog out there...
那儿的竞争异常残酷。
The TV business today is a dog-eat-dog business.
当前电视业的竞争残酷无情。
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PHRASE
败落;大不如前
If you say that something is going to the dogs, you mean that it is becoming weaker and worse in quality.
例句
They sit in impotent opposition while the country goes to the dogs.
国家败落之际，他们加入了软弱无力的反对党。
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PHRASE
别惹麻烦;别多事
If someone tells you to let sleeping dogs lie, they are warning you not to disturb or interfere with a situation, because you are likely to cause trouble and problems.
例句
Why can't she let sleeping dogs lie?
为什么她就不能不多事？
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PHRASE
不接受新事物;不喜欢新玩意儿
If you say 'You can't teach an old dog new tricks', you are suggesting that someone is unwilling to try new ways of doing things.