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| 21. | uranium of natural enrichment |
| 天然浓缩铀 |
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| 22. | fuel assay reactor |
| 燃料试验堆;燃料试验反应堆 |
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| 23. | a fuel pump;fuel tanks. |
| 燃料泵；使用燃料的坦克 |
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| 24. | superfine natural goods (products) |
| 天然精品 |
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| 25. | fuel of high antiknock rating |
| 高抗爆性燃料|高辛烷值燃料 |
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| 26. | natural gem |
| 天然宝石 |
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| 27. | organic gardening is more natural; nonsynthetic fertilizer. |
| 有机园艺更趋于天然；天然肥料。 |
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| 28. | An evident principle |
| 天然之理 |
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| 29. | natural antibody |
| 天然抗体 |
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| 30. | a natural pearl |
| 天然珍珠 |
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