The tendency of a body in motion to continue in motion along a straight line is known as inertia. 运动物体继续作直线运动的倾向叫惯性。
A mechanical movement includes a frame adapted to move only along a linear path of travel. 机械运动包括一个适合于只沿着直线运动的框架。
The practical use of synchronous spindles however shows that the dynamics of the spindle and linear drives produce mistakes in the synchronisation. 但实际使用同步主轴，同步化过程显示，轴的动态运动和线性运动产生错误。
