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

making sure that, you know, the building is kept up, building is safe and maintained,

确保宿舍楼内的安全和秩序。

关于宿舍制度 - SpeakingMax英语口语达人

So they have to be engineered to be inert so that they can be safely inside a system and there's not every material you could pick would have that property.

缝合线必须是惰性的,以便确保植入人体后的安全性,不是随便哪个材料都能做到这一点

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Even when the president first came into the office he is always careful to make sure he was always well briefed, meet regularly with his national security team, with his intelligence briefers, on a regular basis.

即使是总统从一开始,走进办公室,他总会很小心地确保,他有个良好的情况简介，和他的安全小组见面，和情报简报员见面，这些都是定期的。

普林斯顿公开课 - 国际座谈会课程节选