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.

火星转一间比地球长。

The earth rotates on its axis once every 24 hours.

地球每24小依其轴心转一次。

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巨大机器。