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| 31. | concave inward bit |
| 中心凹陷形钻头 |
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| 32. | One type of surface operation is called open pit, or open cut mine. |
| 露天开采中有一种类型叫作凹陷露天矿。称为台阶的水平阶段一直开掘到矿坑底。这些台阶与在陡峭的山坡上开出的梯田相似。 |
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| 33. | Week of Pit Lord: Double growth for Pit Fiends and Pit Lords. |
| 深渊领主周：深渊领主产量加倍。 |
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| 34. | His cheeks have sunk in. |
| 他的脸颊凹陷。 |
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| 35. | ratio of pit-depth to pit-diameter |
| 深径比 |
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| 36. | a bowl-shaped topographic depression. |
| 碗状地形凹陷。 |
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| 37. | excision of depressed cranial fracture |
| 颅骨凹陷骨折切除术 |
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| 38. | mobile geosynclinal trough |
| 活动地槽式凹陷 |
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| 39. | depressed-centre wheel |
| 中央凹陷磨轮 |
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| 40. | inverted Lamb dip |
| 反兰姆凹陷 |
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