在他们餐桌上，我感觉自己像个不速之客。

I felt like an ___intruder at their dinner table.

胡珀认为新来者是个闯入者，应该被暗中迫害。

Hooper considered the newcomer to be an ___intruder, to be subtly persecuted.

这个安全系统旨在检测建筑内的任何闯入者。

The security system is designed to detect any ___intruder in the building.