| 1. | Farming has been an up-and-down industry .
务农一直是起伏不定的行业。 |
| 2. | The surface shows deep rill－like folds .
表面有深沟槽状起伏褶皱。 |
| 3. | And the tempo of the sea speeded up .
同时大海的起伏动荡加剧了。 |
| 4. | There were many ups and downs in the earth's numbers .
世界人口数量变化起伏不定。 |
| 5. | His broad chest heaves with pleasure .
他那宽阔的胸膛，由于满腔欢乐，所以起伏不止。 |
| 6. | The waves danced in the sunlight .
波浪在阳光下起伏。 |
| 7. | Relief must not be so excessive .
地形不应起伏很大。 |
| 8. | The stormy sea is boiling .
暴风雨中的大海汹涌起伏。 |
| 9. | His chest heaved and his body seemed to droop .
他的胸脯上下起伏，身子也好象衰颓了。 |
| 10. | There was a terrible grace in the move of the waves .
起伏的波涛有一种令人敬畏的美。 |
