I pretend that I am a travel agent which means that I can carry out surveillance.

我假装自己是旅行社代理，这意味着我可以进行监视。

The covert surveillance revealed crucial information.

隐蔽的监视揭示了重要信息。

The constant surveillance dehumanized the residents.

持续的监视使失去人性了居民。

Surveillance footage helped solve the crime quickly.

监视录像帮助迅速解决了犯罪案件。

The drone was circling the building for surveillance.

无人机在建筑物上空盘旋进行监视。