自转

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

地球既公转又转。

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

火星转周的时间比地球长。

The earth rotates on its axis once every 24 hours.

地球每24小时依其轴心转次。

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

旋转架通过转把引能转换为电磁辐射的巨大机器。