Police were on guard at Barnet town hall.

警察在巴尼特市政厅值守。

《柯林斯英汉双解大词典》

At the outset, it seemed necessary to be on guard against the other two.

一开始，似乎有必要提防另外两个。

youdao

Men　on　guard　duty　sometimes　think　they　see　something　moving　to　one　side　of　them．

值班的人有时会以为看到了什么东西向他们这边移动。

youdao

Two four-meter-tall sculptures stand guard on either side of a door.

VOA: special.2010.06.23

One of the things, by the way, that Eikhenbaum does in passing is remind us that we should be on our guard against thinking that sound is onomatopoetic--that is, that it reflects the meaning of what it's talking about.

艾肯鲍姆在书中提到,他特别提醒我们,不应该赞同拟声现象，拟声就是认为声音能反应它所表达的意思。

耶鲁公开课 - 文学理论导论课程节选

A rain-soaked President Obama delivered a somber message from a Coast Guard station on Louisiana's threatened coastline.

VOA: standard.2010.05.02

Besides the two Carnival vessels that have come to transfer supplies -- and, in one case, take on a passenger with a pre-existing medical condition, said Gulliksen -- the U.S. Coast Guard cutter Vigorous is on-site to aid the stranded ship.

CNN: STORY HIGHLIGHTS

In other words, the Knicks have allowed MVP-level performances on a nightly basis at the point-guard position.

WSJ: The Knicks' Weakest Link

The total for 2011 was 283 -- 165 confirmed active-duty suicides and 118 confirmed not-on-active-duty suicides (82 Army National Guard and 36 Army Reserve).

CNN: 325 Army suicides in 2012 a record