It's used to load the materials and complete the vertical transportation by the up and down movement.
用于装载物料沿导轨架做上下移动完成垂直运输。
The simplest way to test the correctness of the total movement is to check whether the up-and-down motion of the arm results in a vertical path of the fingertips.
检验总运动的正确性的最简单的方法是核对上下运动的手臂，看看是否指尖的运行轨迹成一条垂直线。
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