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.
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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