门卫在英语中称作"gatekeeper"。这个词来自古英语，由两个单词"gate"和"keeper"构成，"gate"意思是门，"keeper"意思是看守人，因此"gatekeeper"的意思就是看守门的人。

例句：

The gatekeeper at the entrance to the palace checks the visitors' IDs. (门卫在宫殿入口检查游客的身份证。)

The gatekeeper at the entrance to the building checks the visitors' IDs. (大楼入口处的门卫检查游客的身份证。)

The gatekeeper at the entrance to the park checks the visitors' IDs. (公园入口处的门卫检查游客的身份证。)