经理必须对全体员工作出评价。

Managers must appraise all staff.

《牛津词典》

我们每个人都必须对自己的行为负责。

Each of us must take responsibility for our own actions.

《牛津词典》

各部长必须对所作的决定承担责任。

Ministers must be made answerable for their decisions.

《牛津词典》

Now, we are very gentle in this course with respect to knowing integrals, but this is one you have to know.

这门课对积分,的要求并不高，但这个积分你们必须会算。

麻省理工公开课 - 热力学与动力学课程节选

The problem with that answer is before you say something is scripture, you have to say why is it scripture,for whom is it scripture, and what does that mean?

这个回答的问题在于,在把某样东西定义为圣典前，必须明确为什么，对谁来说是圣典，那是什么意思？

耶鲁公开课 - 新约课程节选

Doesn't respond as well to killed vaccines, and that's why the Salk vaccine has to be injected at a high dose.

但却对灭活的疫苗没有那样强烈反应,这也是索尔克氏疫苗为何,必须大剂量注射的原因

耶鲁公开课 - 生物医学工程探索课程节选