| 1. | In the far reaches of the solar system comets range from a few km to a few hundred km across .
在太阳系的广阔空间范围里，彗星的大小一般从几千米到几十万米。 |
| 2. | Celestial mechanics enables astronomers to calculate the positions of the planets at any time in the post or future and to predict the movements of comets .
天体力学使文学家能计算出行星在过去或将来任何时候的位置，并能预报彗星的运行位置。 |
| 3. | I can hardly wait to see the new comet
我急不可待地要见到新彗星的出现。 |
| 4. | The comet ' s path has changed due to jupiter ' s gravity
由于木星的引力，彗星的轨道改变了 |
| 5. | It means that the comet is traveling faster
也意味着彗星的速度也快了 |
| 6. | There are some records on comets in this book that lee gave me
李给我的这本书上有这个彗星的记载 |
| 7. | The small scale splitting of comet
波普彗星的小规模分裂 |
| 8. | The comet ' s cycle is 433 years
彗星的周期是433年 |
| 9. | A comet cannot change course
彗星的轨道是不变的 |
| 10. | It ' s the comet ' s cycle
正好是彗星的周期 |
