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| 41. | to break up of rock |
| 岩石粉碎 |
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| 42. | underlying strata |
| 底板岩石 |
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| 43. | a substratum of rock |
| 底层岩石. |
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| 44. | rock electric drill |
| 岩石电钻 |
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| 45. | crystalline rock |
| 结晶岩石 |
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| 46. | petrographic formation |
| 岩石建造 |
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| 47. | lithologic unit |
| 岩石单位 |
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| 48. | attitude of rock |
| 岩石产状 |
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| 49. | petrographic comparison |
| 岩石对比 |
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| 50. | rockslide; rock failure |
| 岩石崩落 |
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