| 51. | It effectively spread the disease all over the continent and drastically reduced the rabbit population . |
| 蚊子把这种疾病扩散到整个澳洲大陆，效果甚佳，结果兔子的数目在为减少。
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| 52. | It later became apparent that rabbits were developing a degree of resistance to this disease, so that the rabbit population was unlikely to be completely exterminated. |
| 后来，明显看出，兔子对这种疾病已产生了一定程度的免疫力，所以兔子不可能被完全消灭。
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| 53. | An epidemic resulted in overt measles in 99.9% per cent of the indigenous population . |
| 一次流行引起99.9%土著居民患有明显的麻疹。
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| 54. | It causes the population to look upon those in authority as a pack of parasites whose exclusive concern is with the gratification of their private needs and wanes. |
| 这使得广大人民认为，当权者是一群只想满足个人私欲的寄生虫。
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| 55. | It is generally believed that the chief reason for the increase in population in developed countries is not so much the rise in birth rates as the decline in death rates as a result of the improvement in medical care. |
| 普遍认为，在发达国家人口增长的主要原因与其说是出生率的上升，还不如说是由于医疗保健的改善使死亡率下降了。
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| 56. | It must be noted that improvement in agriculture seems to not be able to catch up with the increase in population of rural areas and there are millions of peasants who still live a miserable life and have to face the dangers of exposure and starvation. |
| 必须指出，农业的发展似乎赶不上农村人口的增加，并且仍有成千上万的农民过着缺衣挨饿的贫寒生活。
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| 57. | Many sociologists point out that rural emigrants are putting pressure on population control and social order; that they are threatening to take already scarce city jobs; and that they have worsened traffic and public health problems. |
| 许多社会学家指出民工正给人口控制和社会治安带来压力。他们正在威胁着本已萧条的工作市场，他们恶化了交通和公共卫生状况。
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| 58. | Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements-themselves made relatively easy nowadays by modern means of transport. |
| 由于人口的猛增或大量人口流动（现代交通工具使这种流动相对容易）引发的种种问题也会对社会造成新的压力。
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| 59. | In Australia- where an aging population , life-extending technology and changing community attitudes have all played their partother states are going to consider making a similar law to deal with euthanasia. |
| 在澳大利亚--人口老龄化，延长寿命的技术和变化看的社会态度，这 些因素都在发挥作用一一其他的州也会考虑制定相似的关于安乐死的 法律。
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| 60. | The greater the population there is in a locality, the greater the need there is for water, transportation, and disposal of refuse. |
| 一个地方的人口越多，对其水。交通和垃圾处理的需求就会越大。
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