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| 51. | open pit incineratio |
| 露天坑式焚烧 |
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| 52. | Stone Pit; Quarry |
| 采石场；岩仓 |
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| 53. | commissural lip pit |
| 口角小窝 |
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| 54. | half bordered pit |
| 半具缘纹孔 |
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| 55. | pit ?plane strain |
| 倒角应力 |
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| 56. | open pit development |
| 露天矿开拓 |
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| 57. | foundation pit; trench |
| 基坑 |
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| 58. | biogas generating pit |
| 沼气池 |
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| 59. | primary pit field |
| 初生纹孔场 |
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| 60. | sinkage dock pit |
| 沉坞坑 |
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