别担心，你一点也不必害怕我们。

Don't worry, you have nothing to fear from us.

《牛津词典》

你什么事也不必做—只管悠闲享受乘车旅行的乐趣好啦。

You don't have to do anything—just lie back and enjoy the ride.

《牛津词典》

你不需要每天去杂货店，也不必掌握很多技巧。

You don't have to hit the grocery store daily, nor do you need an abundance of skill.

youdao

You don't have to try to get the change of law You don't have to get the supreme court to change its mind. All you have to do is to get out your credit card and go online and it's done.

不必试图修改法律,也不必游说最高法院,做出什么改变，你需要做的,只是掏出你的信用卡，登陆网站，然后一切搞定。

普林斯顿公开课 - 人性课程节选

In other words, you don't have to be moving actually in a circle to have the acceleration.

也就是说,你不必真的在一个圆上运动以获得相应的加速度

耶鲁公开课 - 基础物理课程节选

So don't be--don't despair if you don't initially land on the tonic here.

所以如果你不能一次找到主音也不要，，不必绝望。

耶鲁公开课 - 聆听音乐课程节选