He works as a door guard for that company.

他在那家公司做门警。

youdao

Still, students admit that the electric door guard is much safer, as it prevents thieves as well as unwelcome salesmen from entering their dorm.

尽管如此，学生们承认，电动门后卫是更安全，因为它可以防止小偷进入，以及他们的宿舍不受欢迎的推销员。

youdao

Two four-meter-tall sculptures stand guard on either side of a door.

VOA: special.2010.06.23

A guard always stood outside the door to the box.

VOA: special.2009.12.31

Two big stone lions guard the front door.

VOA: special.2009.11.16

The hospital was locked down nobody was allowed in, and although eventually the flow of patients began to subside, the men with guns continued to guard every door.

WSJ: Emily Loving Aaronson: On the Front-Lines of Battlefield Triage in Boston

The guard at the door told him no one else but the drivers were permitted anymore.

FORBES: Carl Edwards' Next Left Turn

In Iraq, the gated community has an armed guard on the door and someone checking every vehicle for bombs.

BBC: Iraqi team helping people unite