报警 (bào jǐng): เพื่อรายงานตัวต่อตํารวจ

If you see a thief, you should call the police immediately.

When a fire breaks out in the building, the alarm will automatically sound an alarm.

He heard someone knocking on the door, felt something was wrong, and quickly called the police.

The police said that when you encounter danger, you should call the police as soon as possible.

This system can automatically sound an alarm when an accident occurs.