| 31. | The city's population is in decline. |
| 该市人口在下降。
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| 32. | The population is on the decline. |
| 人口正在减少。
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| 33. | There has been a steady decrease in population in this city. |
| 这个城市的人口在持续下降。
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| 34. | The proportion of men to women in the population has changed so that there are now fewer women and more men. |
| 人口中男女的比例已经起了变化，现在女人较少而男人较多。
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| 35. | Negron constituted ten percent of the general population . |
| 黑人占总人口的10％。
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| 36. | The population of the United States is of a motley character. |
| 美国的人口具有多民族的特点。
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| 37. | China is a country with a very large population composed of many nationalities. |
| 中国是一个由许多民族组成的人口众多的国家。
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| 38. | The population had decreased from 8,300,000 in 1845 to 6,600,000 in 1851. |
| 人口从1845年的830万下降到1851年的660万。
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| 39. | The population density of that country is 685 per square mile. |
| 那个国家的人口密度为每平方英里685人。
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| 40. | You may consult the statistics on population issued by the government. |
| 你可以查一查政府发表的人口统计资料。
|