释文：在天然物质中含量在1%～0.01%的元素。但在地质学中应用不严格，常把含量小于万分之几的元素也称副元素，而与微迹元素（痕量元素）一词混用。
平面高副传动中，如何确定高副元素的曲率半径是一个很重要的问题。
In higher pair plane transmission, it is important to determine the curvature radius of the member.
首次指出了高速运转条件下，运动副副元素由于弹性变形而出现的连续变形接触现象。
When the resulting equations of motion are solved numerically, they show the elements of a clearance joint keeping continuous deformation contact when the mechanism works at high speed.
分析了含间隙运动副副元素的碰撞分离过程，指出线性弹簧阻尼模型不能满足接触边界条件并产生力突变；
This paper points out the disagreement of boundary conditions that generate force discontinuity in the linear spring damping contact model by analyzing the contact modulation of the clearance joint.
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