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41. | natural resin paint |
| 天然树脂漆 |
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42. | natural iron oxide |
| 天然氧化铁 |
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43. | natural nutrient |
| 天然养分 |
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44. | natural terrain obstacles |
| 天然障碍物 |
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45. | natural oil stone |
| 天然油石 |
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46. | natural protein |
| 天然蛋白质 |
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47. | natural pasture |
| 天然牧地 |
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48. | natural seeding |
| 天然下种 |
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49. | natural pollution |
| 天然污染 |
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50. | natural tritium |
| 天然氚 |
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