Although the process involves interaction of the five elements, everything begins with and is based on what happens at the point of contact between the workpiece and cutting tool.
虽然这个工艺与5个因素有关，但所有的都开始于，也建立在工件和刀具之间的接触点上所发生的情况。
The two elements of a lower pair have theoretical surface contact with one another, while the two elements of a higher pair have theoretical point or line contact (if we disregard deflections).
这两个因素中的低副是两个理论表面之间的接触，而这两个因素中的高副是理论的点或线接触(如果我们忽视了挠度)。
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