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| 31. | natural exposure |
| 天然露头 |
|
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| | |
| 32. | natural pollution sources |
| 天然污染源 |
|
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| | |
| 33. | loadstone; lodestone |
| 天然磁石 |
|
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| | |
| 34. | natural grazing grounds |
| 天然牧场 |
|
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| | |
| 35. | a gas field |
| 天然气田 |
|
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| | |
| 36. | natural draft ventilation |
| 天然通风 |
|
|
| | |
| 37. | native sulfate of barium |
| 天然硫酸钡 |
|
|
| | |
| 38. | natural floral note |
| 天然花香 |
|
|
| | |
| 39. | natural consolidatio |
| 天然胶结 |
|
|
| | |
| 40. | natural hardness |
| 天然硬度 |
|
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| | |