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| 41. | Mind the step outside the door. |
| 小心门外的台阶。 |
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| 42. | heading-and-stope system |
| 正台阶回采法 |
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| 43. | Mind the gap |
| 小心台阶间跨度 |
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| 44. | overhand planing |
| 倒台阶式刨削 |
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| 45. | terraced substrate laser |
| 台阶式衬底激光器 |
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| 46. | step profile of invasion |
| 台阶型侵入剖面 |
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| 47. | nominal midstep value |
| 标称台阶中心值 |
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| 48. | Shusheng sat on the steps. |
| 水生坐在台阶上说： |
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| 49. | Mind the steps! |
| 注意台阶！小心脚下！ |
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| 50. | heading-and-bench method |
| 正台阶采矿法 |
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