1.表述：dog’s chance

释义：A very slim chance. Used to describe something that is unlikely to happen. （微乎其微的机会，用语表示某事不可能发生）

例句：Considering you only studied for 10 minutes, you have a dog's chance of passing this test!

考虑到你只学习了10分钟，你通过这次考试的机会微乎其微。

I get really nervous when I present something to the boss, so I think I only have a dog's chance of impressing her today.

当我向老板提交东西的时候，我真的很紧张，所以我想我今天给她留下深刻印象的机会微乎其微。

2.表述：game over

释义：To describe a situation that has failed or is likely to fail. （没戏了,用语描述失败或者可能失败的情况）

例句：If we don't score another goal soon, it'll be game over.

如果我们不赶快再进一个球，这场比赛我们就要失败了。

When she finds out you cheated on her, it'll be game over, dude.

当她发现你对她不忠，你们的关系就完蛋了，伙计。

3. 表述：flog a dead horse

释义：To continue to focus on something—especially an issue or topic—that is no longer of any use or relevance. （继续做一件毫无成功希望的事情）

例句：We've all moved on from that problem, so there's no use flogging a dead horse.

我们不再讨论那个问题了，再讨论也是白讨论。

The history teacher lectured us every day about the importance of studying history, until we begged him to stop flogging a dead horse.

历史老师每天都给我们讲学习历史的重要性，直到我们乞求他不要白费口舌了。

You're flogging a dead horse by trying to persuade Simon to go to Spain with us.

你劝西蒙跟我们一起去西班牙是在白费功夫。

A: Let’s not talk about it anymore, OK?

我们别谈这件事情了，行吗？

B: Yes, you are right. There is no use flogging a dead horse.

是的，你是正确的，再谈也是白谈。