They could be motion control for cameras - which is essentially a big robot that controls a camera that shoots the scene. Lighting rigs, whatever needs to get removed.
也可能是摄像机的移动控制装置，事实上是控制拍摄场景摄像机的大机器人。灯光装置，以及任何需要移除的东西。
Lighting rig
原声例句
VOA Standard 2015年6月合集
英语百科
Stage lighting
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Stage lighting is the craft of lighting as it applies to the production of theatre, dance, opera and other performance arts. Several different types of stage lighting instruments are used in this discipline. In addition to basic lighting, modern stage lighting can also include special effects, such as lasers and fog machines. People who work on stage lighting are commonly referred to as lighting technicians.
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