revolving door
noun
1- an entrance to a large building in which four partitions turn about a central axis旋转门。
1.1
- used to refer to a situation in which the same events or problems recur in a continuous cycle（指相同事件循环发生的情形）循环活动：
many patients are trapped in a revolving door of admission, discharge, and readmission.
许多病人陷入了入院、出院、再入院的怪圈里。
1.2
- usu. as modifier a place or organization that people tend to enter and leave very quickly人们出入频繁的场所（或组织）：
the newsroom became a revolving-door workplace.
新闻编辑室成了人们出入繁忙的场所。
1.3
- chiefly US used to refer to a situation in which someone moves from an influential government position to a position in a private company, or vice versa〈主美〉从政府要职到私营公司任职的转换（或反之）。