The second one is an optimal problem of displacement distribution by controlling partial surfacetraction distribution or varying the surface shape etc.
第二个问题是利用部分边界的边界应力分布或变化边界形状控制表面位移分布。
2
On a slick surface, one wheel may have no traction and begin to spin.
在光滑的地面,一个车轮会丧失牵引力,开始空转。
3
Sliding track was located at top surface of frame column in abnormity surface by computer synchronization controlled hydraulic traction.