3. Not the end of the world
又不是世界末日
Don't worry about the debt. It's not the end of the world.
不要担心债务。又不是世界末日。
Failing a test is not the end of the world. Come on! Let's try a second time.
没考好又不是世界末日。加油！我们再试一次。
We'll be very upset if we don't win the contest but ultimately it's not the end of the world.
如果比赛没赢，我们会很沮丧，但说到底这也没什么大不了的。
4. Feel blue/have the blues
感到忧郁/心情忧郁
He's been feeling blue since the day she left.
自从她走后，他一直闷闷不乐。
I'm such a sensitive person, I usually feel blue on gloomy days.
我是一个非常敏感的人，在阴郁的天气里我总是感到忧郁。
The little girl had the blues for years after seeing her family being burned in the fire.
这个小女孩目睹自己的家人在大火中被烧死后，悲伤了好几年。