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51. | half bordered pit |
| 半具缘纹孔 |
|
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52. | pit ?plane strain |
| 倒角应力 |
|
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53. | foundation pit; trench |
| 基坑 |
|
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54. | fill pit operation |
| 填坑开采法 |
|
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55. | primary pit field |
| 初生纹孔场 |
|
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56. | biogas generating pit |
| 沼气池 |
|
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57. | open pit development |
| 露天矿开拓 |
|
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58. | sinkage dock pit |
| 沉坞坑 |
|
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59. | open pit incineratio |
| 露天坑式焚烧 |
|
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60. | round storage pit |
| 圆形窖穴 |
|
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