fan-shaped laser beam
... fanning strip 扇形片 fantascope 扇形激光束 far field 远场近似 ...
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两个悬臂在两个扇形面内的摆动，使激光束与板材产生任意的相对运动。
Two cantilevers swing in two sector surfaces so as to lead the laser beam and the plate to generate relative motions freely.
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模块上移
模块下移
不移动