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。
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。
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