1. Expression：go to the dogs

Explanation：To become less successful and of worse quality than it was in the past. （衰败，破落，每况愈下，堕落）

Example：He seems to have gone completely to the dogs and spends all his time in the pub.

他好像已经完全堕落了，整天泡在酒吧里。

If you read the English media or watch the cretinosity of television, you would think that the country is going to the dogs.

果你读英语媒体或看电视，你会认为这个国家正在走向堕落。

I always thought my friend Peter had a good future. But then he got hooked on heroin and lost his job and his wife. I never saw a man go to the dogs so fast!

我总以为我的朋友彼徳是很有前途的。但是后来他吸上了毒品，失去了工作，妻子也走了。我从来没有看到过任何人破落得那么快的！

As soon as the gold was all gone, these towns went to the dogs almost overnight. Everybody moved away and these places are ghost towns now, with the wind whistling through the empty houses and shops.

等到金子都淘光了，这些城镇一下子就被人遗弃，彻底完蛋了。那里所有的人都走了，剩下的只有风在吹过空房子和商店的时候发出的沙沙声音。

2. Expression：dog-eat-dog

Explanation：A dog-eat-dog situation is one in which people are willing to harm each other or to use dishonest methods in order to achieve what they want. （残酷无情的，激烈竞争的，损人利己的）

Example：It's dog-eat-dog right now at school because all the top students are competing to be valedictorian.

现在学校里竞争非常激烈，因为所有的优等生都在竞争致告别词的学生代表。

Don't expect this kind of consideration in the real world—it's dog-eat- dog out there.

在现实世界中，不要期望得到这种关心，外面是你死我活的竞争。