Let us again imagine an idealized experiment. A small sphere with an electric charge is forced, by some external influence, to oscillate rapidly and in a rhythmical way, like a pendulum.
我们再来设想一个理想实验，用某种外部影响迫使一个带有电荷的小圆球很快而且有韵律地像钟摆一样振荡起来。
In the Nature experiment, the research team began by placing a microscopically small sphere of gold on a glass surface.
试验中，研究小组开始把一个极小的金球放在玻璃平面上。
He placed a few muscle cells on the surface of a small polymer sphere and some lining cells on the inside.
他把一些肌肉细胞种到一个小小的球形聚合物表层，把内衬细胞种到聚合物内层。
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