It is surprising what a man can do when he has to, and how little most men will do when they don? T have to.

人们在迫不得已时能做到的事令人惊讶不已，可大部分人在无压力的时候做的事情却又少的得可怜。

youdao

This mechanism probably evolved to make sure starving mammals don\\\\\\\'t go to sleep when they should be foraging for food.

这种机制可能是为了确保饥饿的哺乳动物不要在该去觅食的时候沉沉睡去。

youdao

I duppose when their feathers and wings are fully grown , and they don ’ t need the constant care of their parents .

我猜要到他们的羽毛和翅膀完全长成，他们就不需要总是靠父母照顾了。

youdao

"People don't tend to go out and eat a lot when they don't have a lot of money.

VOA: standard.2010.03.18

One is you believe everybody notices you even when they don't.

一是人们都以为别人在注意你，其实不然。

耶鲁公开课 - 心理学导论课程节选

I've passed through Grand Central Station when filming was happening. I don't know what they were filming though.

有一次我从那儿经过，正好有部电影在拍。但我不知道他们在拍什么电影。

电影里的中央车站 - SpeakingMax英语口语达人

When they don't move about normally, it affects how a person thinks and how quickly they react.

BBC: Dementia series

What does a person do when they don't have anything they have to do?

CNN: Commentary: Make the recession work for you

Who will hire them when they don't even know how to get a job?

NPR: Seeking Solutions for the Nation's Broken Schools