In fact you do not have to kill any animals for this kind of research because we do everything in a test tube.

其实，做这种研究,你根本用不着杀害任何动物,因为试验都是在试管中进行的。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Yeah, you probably don't need more than that.

对哦，可能你也用不着那么多车。

How many实战 - SpeakingMax英语口语达人

I want to do this carefully and slowly, and before I even start, let me point out in passing that calculus is not going to help us here.

我要慢点仔细讲这部分,在我开始之前,我需要说明微积分,在这里是用不着的

耶鲁公开课 - 博弈论课程节选

You don't need wheels."

你根本用不着轮子“

耶鲁公开课 - 金融市场课程节选

And most of these commands you don't actually need but this little caret symbol means control, so every keyboard these days has a control key so you hold that and hit X for instance to exit the program.

这里大多数命令你们都用不着,这个小插入符意味着控制，每个键盘都有一个控制键,譬如，当你敲入X时，就退出这个程序。

哈佛公开课 - 计算机科学课程节选