Film Perforation: Hole punched at regular intervals for the length of film, intended to be engaged by pins, pegs, and sprockets as the film is transported through the camera, projector, or other equipment.
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Use cylinders as rollers for moving material or other equipment.
把钢瓶作为转子来移动材料或其它设备。
Do not use cylinders as rollers for moving material or other equipment.
禁止把钢瓶当作搬运材料或其它设备的转子。
Tugboats are also used to tow barges, disabled ships, or other equipment like towboats.
拖船同样也用来拖拽驳船、报废的船或其他拖船。
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