回程运动 meaning in English

back motion
backward motion

Pmt enjoy following advantages over traditional five - coordinates nc machine tools : high stiffness weight ratio , high feed speed , high environmental suitability , high additional technology value etc . but it also has shortcomings such as small workspace , limited area for backhaul movement , complex of moving control and difficult for precision compensation
与传统机床相比,并联机床具有刚度重量比大、响应速度快、环境适应性强和技术附加值高等优点,但它又同时有运动范围(工作空间)小的缺点,特别是回程运动范围有限,驱动控制复杂和难以进行准确的精度补偿。