| 21. | My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity . |
| 我是专门搞石油的，寻找石油比其他任何采矿业对改进钻探作的贡献都要大。
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| 22. | A burst of activity associated with the laying of submarine cables soon confirmed the challenger's observation that many parts of the ocean were two to there miles deep, and the existence of underwater features of considerable magnitude. |
| 铺设海底电缆的热潮很快证实了“挑战者”号的观察结果：海洋中很多地方可深达两三英里，水下特征差异极大。
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| 23. | Bank loans during the prosperity decade did not keep pace with the rising level of economic activity . |
| 十年繁荣期间的银行贷款没有随着经济活动水平的提高而增长。
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| 24. | Participation in economic activity by public agencies faces a similar hurdle. |
| 政府机构参与经济活动，面临着相同的障碍。
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| 25. | Particulate matter in soils and aquatic systems reacts with and influences the biological activity of pesticides. |
| 土壤和水系统中的颗粒物质都与农药的生物活动起反应，并影响后者。
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| 26. | Up to the present time, throughout the eighteenth and nineteenth centuries, this new tendency placed the home in the immediate suburbs, but concentrated manufacturing activity , business relations, government, and pleasure in the centers of the cities. |
| 到目前为止, 经历了18和19两个世纪, 这种新的倾向是把住宅安排在城市的近郊, 而把生产活动、商业往来、政府部门以及娱乐场所都集中在城市的中心地区。
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| 27. | We should work be such a significant source of human satisfaction.A good share of the answer rest in the kind of pride that is stimulated by the job , by the activity of accomplishing. (Leonard R.Sayles, British writer) |
| 为什么工作竟然是人们获得满足的如此重要的源泉呢？最主要的答案就在于，工作和通过工作所取得的成就，能激起一种自豪感。(英国作家 塞尔斯.L.R.)
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| 28. | This nation is now enjoying great commercial and industrial activity . |
| 现在这个国家在工商业上有很大的活力。
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| 29. | Business is recovering activity . |
| 商业又活跃起来。
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| 30. | We need a little activity to keep ourselves warm. |
| 我们要稍微活动一下来暖和身体。
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