But you don't want to have to run it a long time, every time you have a hypothesis.

但是你不必每次有一个假设，都要去运行很长时间。

麻省理工公开课 - 计算机科学及编程导论课程节选

And the point of this is so that you don't come to class heads down the whole time thinking everything I say is absolutely worthy of being written down.

这样做的意义在于你不必,从头到尾去考虑要不要,把我所说的都记录下来。

哈佛公开课 - 计算机科学课程节选

They do the big step of inventing vowels so that now you don't have to remember anything.

他们在发明元音方面迈出重大一步,所以现在你不必去费力记忆

耶鲁公开课 - 古希腊历史简介课程节选

You don't have to work very hard to figure out what these different facial expressions mean.

你不必努力地去学习,去辨析不同面部表情的含义。

耶鲁公开课 - 心理学导论课程节选

You don't have to petition the government to do something.

你不必再去请求政府,出面做什么事情。

普林斯顿公开课 - 人性课程节选

No need to worry if you're doing things right.

如果你按照教义去做就不必担心

耶鲁公开课 - 古希腊历史简介课程节选