邻居们发现一名闯入者正试图撬开那栋空房子的门锁。

The neighbors spotted an ___intruder trying to pick the lock of the vacant house.

他未经邀请就来参加派对，感觉自己像个闯入者。

He felt like an ___intruder at the party since he wasn't invited.

她不喜欢那位总是像个闯入者一样打探她私事的阿姨。

She dislikes that aunt who always acts like an ___intruder by prying into her personal matters.