| 1. | The inscription of the monument has worn away over a long period of time .
年深月久，碑文已经磨灭了。 |
| 2. | The lease will be renewed for the same period of time as the original agreement .
租约将履约按原期更新。 |
| 3. | Smaller particles were more active, but persisted for a shorter period of time .
较小的颗粒更为活泼，但持续时间较短。 |
| 4. | The ground state of hydrogen is stable for an indefinitely long period of time .
基态氢可以在无限长的时期内处于稳定状态。 |
| 5. | The bank was formed by the mud and sand deposited here over a long period of time .
河里的泥沙淤积在这里，年深日久便成了沙洲。 |
| 6. | If the payments are made over an infinite period of time the annuity is called a perpetuity .
假如支付期是无限的，称为永久年金。 |
| 7. | In a synchronous procedure, all events take place within a specified period of time .
在同步方式中，所有动作都在特定的期间内产生。 |
| 8. | But after a period of time they reorient the dances to the earth's magnetic field .
但过了一段时间之后，它们的飞舞重新取向于地磁场。 |
| 9. | The sun naturally appears to us to traverse the ecliptic in the same period of time .
在我们看来，太阳自然在相同时间内沿黄道运行一周。 |
