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| 51. | secondary soil pit |
| 补助剖面 |
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| 52. | fill pit operation |
| 填坑开采法 |
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| 53. | round storage pit |
| 圆形窖穴 |
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| 54. | pit drainage pump |
| 矿山排水泵 |
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| 55. | working pit edge |
| 工作帮 |
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| 56. | smooth pit peach |
| 光核桃 |
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| 57. | mountain pit-viper |
| 山铬铁头蛇 |
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| 58. | pit bull terrier |
| 美国斗牛? |
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| 59. | mud setting pit |
| 泥浆沉淀槽 |
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| 60. | pit prospecting method |
| 矿坑勘探法 |
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