周围一片寂静，只有一面绸旗轻轻摆动的声音。

There was nothing to be heard but the soft flap of a silk banner.

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两个悬臂在两个扇形面内的摆动，使激光束与板材产生任意的相对运动。

Two cantilevers swing in two sector surfaces so as to lead the laser beam and the plate to generate relative motions freely.

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经典的质心轨道根数，以及系绳在质心轨道面内与轨道面外的摆动角，均可由上述六个广义坐标及其广义速度确定。

All classic orbital elements and usual angular motion parameters can be calculated with the new set of generalized coordinates and their rates.

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