Then how USM works and how the ellipse trace of particle on the surface of stator forms are analyzed.

接着分析了超声波电动机的工作原理和定子表面质点椭圆运动的形成机理。

youdao

And close to the mast step the starboard deck plank has small oval surface. It is the trace of a pomp, of course!

并靠近桅杆一步右舷甲板木板小椭圆形的表面。这是一个泵的踪迹，当然！

youdao

This grinding has its merits, but its force fluctuates greatly and the trace of vibration appears on the surface of the camshaft.

这种磨削加工工艺有一定的优势，但同时会在被加工表面留下往复振荡的痕迹及出现磨削力的波动较大等现象和问题。

youdao

Yet within it there are traces of the past that surface from time to time, yet one past trace that I'm sure those of us who live in the British Isles have all seen are the coastal defences rapidly constructed during World War II.

BBC: The Last Stand

Rather, as a consequence of injecting water and sand into the shale formation to crack the rocks so gas and oil will flow, massive amounts of waste water comes back to the surface with significant amounts of contaminants as a result of leaching out salt, heavy metals and trace amounts of radioactive materials from the rock formation itself.

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