| 51. | 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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| 52. | The law of conservation and transformation of energy is the chief basis of physical, astronomical and chemical reasoning as well as of engineering practice. |
| 能量守恒和能量转换的定律，不仅是工程实践的主要根据，而且也是物理、天文以及化学等方面推理的主要根据。
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| 53. | The chief of the police department demanded severe punishments for criminals. |
| 警察局长要求严惩罪犯。
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| 54. | What is the chief town in Norway? |
| 挪威的主要城市是哪一个？
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| 55. | His ability to get on with people is his chief asset. |
| 他能和人相处是他主要的优点。
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| 56. | The flames caught the main [ chief ] building of a business company and its extension. |
| 大火烧着了一家商业公司的主楼及其附属建筑。
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| 57. | The chief business of a teacher is to help his students. |
| 教师的主要职责是帮助学生。
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| 58. | China's chief articles of export trade with America. |
| 中国对美国输出贸易的主要商品。
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| 59. | What are the chief [principal] attractions of tonight's performance. |
| 今晚的演出有哪些主要的精彩节目。
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| 60. | They represented him as the chief conspirator .. |
| 他们说他是主谋。
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