If one of the group sounds the alarm, others will try to swim to its aid, and become stuck themselves.

如果其中一个成员发出警报，其他成员就会试图向它游去并提供帮助，然后它们也会被困住。

youdao

Any intruders will trip the alarm.

任何非法入室者都会触响报警器。

《牛津词典》

Opening this door will set off the alarm.

一开这道门，警铃就会响。

《牛津词典》

But the two left-handers escaped further alarm and will need to do considerably more on day two for India to haul themselves back into a game they looked in control of a few hours earlier.

BBC: Akmal continued his superb recent form to defy the Indians

It is a result that will ring alarm bells for the party leadership - Delaware is one of a handful of states where the Republicans must win if they are to seize control of the Senate, he adds.

BBC: Mainstream Republicans in Tea Party primaries setback

Or there's the stand-alone alarm, which emits a loud sound when tripped--hopefully a neighbor will hear the noise and call the police.

CNN: ASIANOW - TIME Money | Keeping It Safe | 11/99