因此必须采取措施确保欠发达国家安全地管理他们的反应堆。

So steps must be taken to ensure that less-developed countries run their reactors safely.

youdao

Can you give us a couple of examples what he'd do in a day or when a situation arises to safeguard the national security.

你可以举些例子,说说总统每天做什么,当情况发生时如何处理,来确保国家安全吗。

普林斯顿公开课 - 国际座谈会课程节选