punctured disk
... punched hole 穿孔 punctured disk 有孔圆盘 puppe exact sequence 普佩正合序列 ...
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一种装置，其中被压空气或蒸汽冲击一个旋转的有孔圆盘而产生巨大的、常常是尖锐的声音，作为信号或警报。
A device in which compressed air or steam is driven against a rotating perforated disk to create a loud, often wailing sound as a signal or warning.
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