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| 51. | natural terrain obstacles |
| 天然障碍物 |
|
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| | |
| 52. | natural oil stone |
| 天然油石 |
|
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| | |
| 53. | natural pasture |
| 天然牧地 |
|
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| | |
| 54. | natural whet stone |
| 天然磨刀石 |
|
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| | |
| 55. | natural pollution |
| 天然污染 |
|
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| | |
| 56. | natural seeding |
| 天然下种 |
|
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| | |
| 57. | natural protein |
| 天然蛋白质 |
|
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| | |
| 58. | natural tritium |
| 天然氚 |
|
|
| | |
| 59. | natural resin paint |
| 天然树脂漆 |
|
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| | |
| 60. | naturally-occurring uranium |
| 天然铀 |
|
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| | |