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| 61. | creation of new knowledge |
| 新知识的开拓 |
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| 62. | opening up by blindshaft |
| 暗井开拓 |
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| 63. | developed coal reserves |
| 开拓煤量 |
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| 64. | development and driving of coal mines |
| 煤矿开拓掘进 |
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| 65. | underground mine development |
| 矿山地下开拓 |
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| 66. | developed ore reserves |
| 开拓矿量 |
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| 67. | panel development |
| 盘区开拓 |
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| 68. | fully developed mine |
| 已开拓矿山 |
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| 69. | indirect analytic continuation |
| 间接解析开拓 |
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| 70. | Developing a30-acre tract. |
| 开拓三十英亩土地 |
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