The school hired a new housekeeper to maintain the cleanliness of the teaching building.

housekeeper 是由 house（房屋）和 keeper（看守者、管理者）组成的复合名词，字面意思是"房屋管理者"，实际指负责清洁和维护房屋的专业人员，即"保洁员"或"管家"。