我听到房子后面有闯入者。

I heard ___intruders at the back of the house.

警方认为闯入者当时在寻找一份特定的文件。

The police believed the ___intruders were searching for a specific document.

这套精密的安全系统在闯入者能够进入金库之前就成功阻止了他们。

The sophisticated security system successfully deterred the ___intruders before they could access the vault.