You've got negative charge in motion, and it's in a circular orbit.
负电荷在运动，它们处在一个环形的轨道中。
Thee earth moves in an approximately circular orbit around the sun.
地球在一个近似正圆的轨道上绕着太阳运行。
Orbit of the Earth can be considered to be circular.
地球轨道可认为是圆形的。
Orbit of the Earth can be considered to be circular.
地球轨道可认为是圆形的。
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