bathhouse:浴场,澡堂,更衣室locker-room:更缓首拦衣室,adj.小圈子的dressingroom:(演员的)化装间;(英国英语,运动员的)更衣室lockerroom:(学校、扰胡体育馆等设有锁芹茄柜的)更衣室,衣物间changingroom:更衣室
staff's locker room更准确
Staff changing room
Staff's Dressing Room