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| 1. | primary power source |
| 主动力源 |
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| 2. | primary source material |
| 原始生油物质 |
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| 3. | primary source text |
| 主源程序正文 |
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| 4. | The fishing industry was a primary source of colonists' wealth. |
| 捕鱼业是殖民者财富的主要来源。 |
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| 5. | device primary source |
| 设备主源 |
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| 6. | primary pollution source |
| 主要污染源 |
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| 7. | primary source of infection |
| 初侵染源 |
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| 8. | primary light source |
| 一次光源 |
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| 9. | primary neutron source |
| 初始中子源 |
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| 10. | This is the primary source from which human knowledge develops. |
| 这是人的认识发展的基本来源。 |
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