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| 31. | pit ?plane strain |
| 倒角应力 |
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| 32. | Pit Tomb Culture |
| 竖穴墓文化 |
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| 33. | a bottomless pit |
| 深坑 |
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| 34. | primary pit field |
| 初生纹孔场 |
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| 35. | vertical pit furnace |
| 井式炉 |
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| 36. | commissural lip pit |
| 口角小窝 |
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| 37. | dug-pit latrine |
| 坑式厕所 |
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| 38. | foundation pit; trench |
| 基坑 |
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| 39. | Stone Pit; Quarry |
| 采石场；岩仓 |
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| 40. | open pit development |
| 露天矿开拓 |
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