intruder

The silent security alarm alerted the police to the presence of an intruder in the office.

(Chinese) 无声防盗警报向警方提示办公室内有闯入者。

Homeowners installed high fences and cameras to discourage potential intruders from entering.

(Chinese) 房主安装了高围栏和摄像头，以阻止潜在的闯入者进入。