• 秘密地

behindprep.在...之后；迟于...；落后于；基于；追赶adv.在后面地；落后地；迟；不如n.<口> 屁股behind with拖拉； 积压； 落后； 误期

1. The society held a series of meetings behind closed doors.
   这个团体举行了一系列的秘密会议。
2. Investigators will depose the witness behind closed doors.
   调查员们将让证人们在关闭的门后宣誓作证。
3. The meeting was held behind closed doors.
   会议秘密进行。