| 1. | They may endure as varieties for very long periods .
在极长时期内停留在变种阶段。 |
| 2. | The companies have performed well over long periods .
可是长期以来，这些公司确实成绩斐然。 |
| 3. | The result of this experiment was not noticeable for a long period .
这个实验结果长期不显著。 |
| 4. | " modern " can refer to a longer period up to the present .
“modern”可指直至当前的一段较长时期。 |
| 5. | 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。 |
| 6. | This country had now entered upon a long period of stagnation .
从此，这个国家进入了一个长期不景气的时期。 |
| 7. | Some species can survive for long periods in very low oxygen tensions .
有些种类能在很低的氧气张力下长期生活。 |
| 8. | There were long periods when settled government can hardly have existed .
在校长的时间内一直未存在过稳定的政府。 |
| 9. | His poetry had finally broken through a long period of neglect and prejudice .
他的诗歌终于突破了长期的冷落与偏见。 |
