动词短语
中文翻译：警惕
同义词：
['be on the lookout', 'keep an eye on', 'be vigilant']
例句：
-
1. The police are on watch for any suspicious activity in the area.
警方正在警惕该地区的任何可疑活动。
-
2. He was on watch when the fire alarm went off.
火灾警报响起时，他正在警惕。
-
3.The security guard is on watch at all times to prevent any trespassing.
保安全天候警惕，防止任何闯入。