There must be a guard on duty somewhere. Let's go find him.

一定有警卫在哪个地方值班。我们去找他。

youdao

Being the guard, academic editorial department should be on the duty to maintain academic standard.

作为学术“守门人”的编辑出版部门，在维护学术规范上有着义不容辞的职责。

youdao

His personal archive of documents will be packed up and, at 20:00 (19:00 GMT) on Thursday, the Swiss Guard on duty at his Castel Gandolfo residence will be dismissed, to be replaced by Vatican police.

BBC: Pope Benedict XVI recalls joy and 'choppy waters'

And for many commuters making the journey to work during this morning's rush hour, seeing the National Guard on duty certainly seems to be boosting confidence.

BBC: California's bridges 'under threat'