And if you're not, you can say you are in low spirits.

如果你过得不开心，你可以说你情绪低落（in low spirits）。

And when her housemates are in low spirits, she does something to lift their spirits.

当她的室友情绪低迷的时候，她会做一些事情振奋他们的精神。

If you are in low spirits, it's important to do things to lift your spirit.

如果你闷闷不乐，做一些让你能振奋起来（lift your spirit）的事情很重要。

" There is nothing worse than to confess being in low spirits, " said Missy.

“没有什么比承认情绪低落更糟糕的了， ” 米西说。

" Yes, pardon me. I am in low spirits to-day, and I have no right to bore people, " answered Nekhludoff.

“是的，请原谅。我今天情绪低落， 我没有资格让人厌烦， ” 聂赫留朵夫回答说。