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| 21. | H2O, that is a major source of ore of boron. |
| 四水硼砂一种无色或白色的光亮晶体矿物，Na2B4O7?H2O，是硼矿的主要来源 |
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| 22. | As the range increases thermal noise tends to take over as the major source of inaccuracy. |
| 当射程增大时，热噪声将成为一个主要的误差源。 |
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| 23. | The export of our goods contribute one of the major source of foreign exchange in our province. |
| 本公司产品的出口是我省创汇的主要渠道之一。 |
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| 24. | The current "high-tech" agricultural production system is a major source of environmental degradation |
| 当前高度技术化的农业生产体系是美国环境变劣的一个主要根源。 |
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| 25. | Books keep records of thoughts and ideas, and are the major source from which people obtain knowledge |
| 书本记录着思想和理念，也是人们获取知识的主要来源。 |
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| 26. | Krill, in turn, are a major source of food for many sea animals, including penguins, seals, and whales |
| 依次，磷虾又是包括企鹅、海豹和鲸鱼在内的很多海洋动物的主要食物来源。 |
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| 27. | Guangdong rivers are Hong Kong's major source of water, and will meet all future increases in demand. |
| 广东省的河流是本港主要的供水来源，日后本港食水需求增加，均会由这方面的水源应付。 |
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| 28. | Books keep records of thoughts and ideas, and are therefore the major source from which people obtain |
| 书本记录着思想和理念，所以也是人们获取知识的主要来源。 |
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| 29. | an Arab kingdom in Asia on the northwestern coast of the Persian Gulf; a major source of petroleum. |
| 亚洲的一个阿拉伯王国，位于波斯湾的西北岸；有大量的石油储量。 |
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| 30. | The Police Welfare Fund has been the major source of finance for all welfare activities within the Force |
| 警察福利基金是警队各项福利活动的重要经费来源。 |
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