有一个环形轨道。
We do have a circular track.
youdao
我站在那里看小火车吱吱嘎嘎地在环形轨道上自己开着。
I stood and watched the train chug around the loop of track without me.
负电荷在运动，它们处在一个环形的轨道中。
You've got negative charge in motion, and it's in a circular orbit.
它在地球的轨道上做环形运动。
Its orbit is within the earth's orbit.
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模块下移
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