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。

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Based on the orbit equation of particle motion in central force field, the stable property and close property of orbit were discussed.

在中心势场中粒子运动轨道方程的基础上，进一步讨论粒子轨道的闭合性、稳定性。

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This paper presents some equations of adjoint motion for spacecrafts moving in elliptic orbit of different plane.

本文给出在非共面椭圆轨道上运行的航天器的伴随运动方程。

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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。

麻省理工公开课 - 固态化学导论课程节选

Soon, however, the object's motion suggested it was in an orbit around the Earth.

BBC: New 'moon' found around Earth

It certainly seemed to fit with previous work which had detected a wobble in the star's motion caused by a body the size of Jupiter circling in a very close orbit every 3.5 days.

BBC: We saw it too, say astronomers