自转

The earth revolves both round the sun and on its own axis.

球既公转又转。

Mars takes longer to revolve on its axis than the earth.

火星转一周的时间比球长。

The earth rotates on its axis once every 24 hours.

球每24小时依其轴心转一次。

The spinar is a gigantic machine converting gravitational binding energy into electromagnetic radiation by means of rotation.

旋转体是一架通过转把引力束缚能转换为电磁辐射的巨大机器。