残酷无情的竞争；损人利己的角逐；相互残杀
a situation in business, politics, etc.
where there is a lot of competition and people are willing
to harm each other in order to succeed
I'm afraid in this line of work it's a case of dog eat dog.
恐怕在这种行业中竞争是残酷无情的 。
2、a dog in the manger
占马槽的狗；占着茅坑不拉屎的人
a person who stops other people from enjoying
what he or she cannot use or does not want
3、a dog's life
悲惨的生活；牛马不如的生活
an unhappy life, full of problems or unfair treatment
4、every dog has his/its day
(saying) 人人皆有得意时
everyone has good luck or success at some point in their life
5、give a dog a bad name
(saying) 恶名难洗；名声一毁， 万难挽回
when a person already has a bad reputation, it is difficult to change
it because others will continue to blame or suspect him/her
6、not have a dog's chance
毫无机会；绝无可能
to have no chance at all
He hasn't a dog's chance of passing the exam.
他根本不可能通过这次考试 。
参考资料：
狗用英语怎么写 你好！
dog 英[d?g] 美[d?:g]
n. 狗; 蹩脚货; 丑女人; 卑鄙小人;
v. 困扰; 跟踪;
[网络] 小人; 人; 道格;
[例句]Outside, a dog was barking.
外面， 一只狗在叫 。
狗英语单词怎么说 狗
[gǒu]
dog doggie mut mutt pooch purp
汉英词典
狗
[gǒu]
名
{动} dog
猎狗
hunting dog;hound;
哈巴狗
Pekinese;Peking poodle;
走狗
running dog;
疯狗
dog infected with rabies;
母狗
bitch;
小狗
puppy
形
[骂] (该死的；可恶的) damned；cursed
狗地主
the cursed landlord
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