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| 21. | development drift |
| 开拓平巷 |
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| 22. | mine development |
| 矿山开拓 |
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| 23. | prolongation theorem |
| 开拓定理 |
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| 24. | expand the Business scope |
| 开拓业务 |
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| 25. | Reclaim the wasteland |
| 开拓荒地 |
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| 26. | developing entry |
| 开拓巷道 |
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| 27. | opening up by vertical shafts |
| 竖井开拓 |
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| 28. | damming development |
| 筑坝开拓 |
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| 29. | lateral development |
| 水平开拓 |
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| 30. | innovative progress |
| 开拓进展 |
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