【摄】camera bellows(plural)

现喻指不让大众知道的事情或手段something secretive; dark box

• 湖南这次校场选马的探索,特别敢于把过去习惯的“暗箱”打开。

  This exploration into the selection of talented personnel in Hunnan province is aimed at opening the "dark box" of past practices.

• 打破行政审批暗箱。

  Make public administrative procedures for examination and approval.