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41. | working pit edge |
| 工作帮 |
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42. | open pit incineratio |
| 露天坑式焚烧 |
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43. | biogas generating pit |
| 沼气池 |
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44. | mud setting pit |
| 泥浆沉淀槽 |
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45. | half bordered pit |
| 半具缘纹孔 |
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46. | round storage pit |
| 圆形窖穴 |
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47. | sinkage dock pit |
| 沉坞坑 |
|
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48. | mountain pit-viper |
| 山铬铁头蛇 |
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49. | fill pit operation |
| 填坑开采法 |
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50. | smooth pit peach |
| 光核桃 |
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