The perpetrator of the crime does not have to be traced before you can claim compensation.

不一定非要抓住罪犯之后你才能够索赔。

《柯林斯英汉双解大词典》

One does not have to study?

谁都不需要学习吗？

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Gamification does not have to be digital.

游戏化不一定要数字化。

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Catheters are placed inside the body to collect waste fluids, so the patient does not have to get out of bed.

VOA: special.2010.05.25

As we'll see in section today, a vaccine does not have to be totally perfect in order to prevent transmission of a disease, because when a disease enters a community its spread from one person to another.

有如我们今天看到的,疫苗不一定非要,绝对完美地阻止疾病的传播,因为当疾病侵入一个社区后,会在人群间传播

耶鲁公开课 - 生物医学工程探索课程节选

We are not talking about the cure for cancer, but it does have it within it to help us make sense of things.

虽然诗歌不能治愈癌症,但它确实能够帮助我们理解事物。

普林斯顿公开课 - 人性课程节选

And privacy does not have to be a net loser in a world of electronics.

FORBES: Let's Get the Engineers

In return, the deal means Berkshire does not have to spend billions of dollars up front.

BBC: Buffett to get increased share in Goldman Sachs

It does not have to be a parent, but it has to be someone.

CNN: How to get teachers to teach and students to learn