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| 31. | naturally-occurring uranium |
| 天然铀 |
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| 32. | And quite deservedly so. |
| 这也确是理所当然的事。 |
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| 33. | By nature; naturally |
| 天生地;天然地 |
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| 34. | naturally occurring radioactivity |
| 天然来源的放射性 |
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| 35. | naturally aspirated engine |
| 自然进气式发动机 |
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| 36. | naturally-occurring repository |
| 天然资源储藏所 |
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| 37. | naturally encroaching water |
| 天然侵入水 |
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| 38. | naturally alloyed steel |
| 天然合金钢 |
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| 39. | naturally fractured reservoir |
| 天然裂缝性储层 |
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| 40. | naturally pigmented wool |
| 天然有色羊毛 |
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