1N-COUNT [usually plural]旋转门 Some large buildings have revolving doors instead of an ordinary door. They consist of four glass doors which turn together in a circle around a vertical post. 旋转门
As he went through the revolving doors he felt his courage deserting him.
走过旋转门的时候，他觉得自己丧失了勇气。
...the doorman by the revolving door.
旋转门附近的门卫
2N-COUNT [usually singular]人员频繁流动 When you talk about a revolving door, you mean a situation in which the employees or owners of an organization keep changing. 人员频繁流动 [disapproval]
They have accepted an offer from another firm with a busy revolving door.