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| 31. | consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major |
| 一种含有二氧化钛的矿物，呈晶体状，见于变质岩和火成岩中，是钛的主要来源。 |
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| 32. | a a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular |
| 肌肉细胞中由腺苷衍生而来的核苷酸，细胞反应的主要能源。 |
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| 33. | Minute marine organisms, such as crustaceans of the genus Calanus, that are a major source of food for |
| 哲水蚤小海生动物，如哲水蚤属的甲壳类动物，是露脊鲸食物的主要来源 |
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| 34. | The major source of confusion for foreign investors, however, is not the tax rate but who has the authority |
| 然而，令外国投资者困惑的主要原因不是税率问题，而是谁具有批准项目权利的问题。 |
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| 35. | Animal husbandry and aquaculture have become points of rural economic growth and a major source of the |
| 畜牧和水产养殖已成为农村经济增长点和农民增加收入的重要来源 |
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| 36. | The fossilization of the learner's inter-language is believed to be a major source of incorrect forms |
| 据认为，学习者语际语的僵化现象是导致错误的语言形式的不可救药的主要原因。 |
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| 37. | but, except during World War I, the income tax system was not a major source of federal revenue until |
| 但在３０年代以前，除了第一次世界大战期间以外，所得税系统并不是联邦税收的主要来源。 |
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| 38. | A major source of these compounds is the burning of fossil fuels (coal, oil, and natural gas) in industry |
| 在工业和运输行业中化石燃料（煤、石油和天然气）的燃烧是这些化合物的主要来源。 |
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| 39. | tropical marine bivalve found chiefly off eastern Asia and Pacific coast of North and Central America; a major |
| 主要产于亚洲东部远海和美洲北部及中部太平洋沿岸的热带海洋双壳动物；珍珠的主要来源。 |
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| 40. | However, in wet seasons, the major source of groundwater is mainly from the groundwater divide on the |
| 本区地下水于枯水季时主要由中央山脉的侧流补注，丰水季时则主要由含水层上游的马鞍溪补注。 |
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