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| 21. | essentially aluminum beryllium silicate, Be3Al2Si6O18, occurring in hexagonal prisms and constituting the chief |
| 绿玉一种透明到半透明的玻璃状矿石，主要成分为硅酸铝铍，Be3Al2Si6O18，呈六棱柱结构，是铍的主要来源。各种透明的白色、绿色、蓝色、黄色或粉色绿玉与宝石价值相当 |
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| 22. | The federal government's chief source of revenue has been the income tax, which in recent years has brought |
| 联邦政府的主要税收来源是所得税，最近几年所得税占联邦税收总额的五分之二。 |
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| 23. | Since a chief source of pollutants is automobile emissions, it might be expected that pollutant levels |
| 因为污染物的主要来源是汽车的排出物，所以可以料想污染物的浓度至少在某种程度上是与汽车运输有关。 |
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| 24. | in warm regions of India and Indonesia and United States for forage and especially its edible seeds; chief |
| 一种直立灌木状的一年生豆类，可能原产于印度，现广泛栽培于温暖地区，做绿肥或饲料，种子可食，通常为绿色或黄色。 |
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| 25. | The chief source of light for outdoor shooting is sunlight. |
| 主要光源称为主光。主光常常用辅光作补充。室外拍摄的主光为阳光。 |
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| 26. | their hands, have greatly swelled the government statistics of crime professionals and constitute the chief |
| 电视训练出来的手“周末小手枪”的新一代的业余歹徒们，使得政府关于职业罪犯的统计数字猛增狂涨，并成为社会治安不宁的主要根源。 |
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| 27. | "From the early 19th century to the present, the chief source of power in farming has changed from animals |
| 从19世纪初到现在,农业生产的主要动力已从牲畜转变为蒸汽机动力,再来是汽油引擎驱动,最后是柴油引擎。 |
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| 28. | essentially aluminum beryllium silicate, BeAlSiO, occurring in hexagonal prisms and constituting the chief |
| 绿玉：一种透明到半透明的玻璃状矿石，主要成分为硅酸铝铍，BeAlSiO，呈六棱柱结构，是铍的主要来源。各种透明的白色、绿色、蓝色、黄色或粉色绿玉与宝石价值相当。 |
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| 29. | Financial allocation is a chief source of Kuomintang's outlay for party affairs. |
| 国民党党务经费来源的主渠道是财政拨款,其他来源还有收党费和特别捐,向社会筹集资金和海内外捐款等。 |
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| 30. | "The chief source of methane is natural gas, but it can also be produced from coal. |
| 甲烷的主要来源是天然气，但也可以用煤来生产。甲烷储量丰富，价格便宜，又干净，所以广泛用作家庭、商业设施以及工厂的燃料。作为一种安全措施，在甲烷中掺入痕量的有味气体以便辨识。 |
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