gatehouse

詳細解釋：

gate.house

n.（名詞）
A lodge at the entrance to the driveway of an estate.
門房：位於一大宅子的私用車道的出口處的小屋
A fortified structure built over the gateway to a city or castle.
城樓：一個有防禦性的建築物，建到一城市或城堡的通道上
A building that houses the controls of a dam or canal lock.
閘門控制室：一種構築物，掌管堤壩或運河閘門