| 1. | The earth completes one revolution each day .
地球每天完成一次自转。 |
| 2. | Soon this frenzied rotation slows down .
不久，这种疯狂的自转便减慢了。 |
| 3. | The earth rotates once a day on its axis .
地球绕它的自转轴一天旋转一周。 |
| 4. | The earth revolves both round the sun and on its own axis .
地球既公转又自转。 |
| 5. | The earth revolves both about the sun and on its own axis .
地球又公转又自转。 |
| 6. | The earth revolves both round the sun and on its own axis .
地球又公转又自转。 |
| 7. | The spin phenomenon exists only in quantum theory .
只有在量子理论中才出现这样的自转效应。 |
| 8. | Venus has the distinction of spinning "backward" on its axis .
金星具有沿主轴反向自转的特性。 |
| 9. | Seen from the earth, the sun rotates in about 27 days .
从地球上观测，太阳的自转周期约为27天。 |
| 10. | In the case of the moon the rotation keeps pace exactly with the revolution .
月球的自转与公转精确地同步。 |
