词典释义：
释义
n.
an entrance to a large building in which four partitions turn about a central axis
旋转门。
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
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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。
[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）
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the newsroom became a revolving-door workplace .新闻编辑室成了人们出入繁忙的场所。
〈主美〉 从政府要职到私营公司任职的转换（或反之）。