alert police

报警：向警方发出紧急通知或请求帮助的行为。
常用释义
报警：向警方发出紧急通知或请求帮助的行为。

例句

一位警惕的警官发现了一辆满载炸药的卡车。

There are dozens of CCTV cameras in the area to alert police to suspicious activity.

该地区安装了许多摄像头，以方便警察鉴别可疑活动。

After Sabaj showed the bag to his father, with whom he lives, they decided to alert police.

在给和自己同住的父亲看过之后，两人决定先报警。