Any linkage which contains a screw pair, for example, is a spatial mechanism, since the relative motion within a screw pair is helical.
举例子，任何含有螺旋副的连杆机构，由于它的相对运动是螺旋线形的，因此是空间的机构。
Cold beating lead screw plays the role of high-speed relative motion in the way of high-speed blowing shaft blanks, so that local plastic deformation forms a non-chip metal forming technique.
丝杠冷打是在工具和丝杠高速相对运动中，以高速断续的方式击打丝杠轴坯，使丝杆轴坯局部塑性变形形成丝杠螺纹的一种无屑塑性成形技术。
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