It is difficult to make the choice of the motion point and the motion coordination in the study of the compound movement of the motion research.
在运动学点的复合运动研究中，平面机构运动动点与动系的选择是一难点。
It is difficult to make the choice of the motion point and the motion coordination in the study of the compound movement of the motion research.
在运动学点的复合运动研究中，平面机构运动动点与动系的选择是一难点。
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