Even the gliding mouse happily shining on the floor with speed. 就連滑鼠都流暢地在地板上閃亮滑動(dòng)。
As two rough surfaces slide over each other,some of the projections wear off,possibly a few molecules at a time. 每當粗糙表面互相貼著(zhù)滑動(dòng)時(shí)，某些凸出部分會(huì )被磨去，也許一次磨去幾個(gè)分子。
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