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| 21. | bench excavation |
| 台阶式挖掘 |
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| 22. | Machining of step dimension |
| 台阶尺寸加工 |
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| 23. | striding the stage. |
| 大踏步走过台阶 |
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| 24. | nominal step value |
| 标称台阶值 |
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| 25. | dynamic terrace precision |
| 动态台阶精度 |
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| 26. | flat-back stope |
| 逆台阶工作面 |
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| 27. | landscape terrace |
| 园景台阶 |
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| 28. | cylinder ridge reamer |
| 汽缸台阶铰刀 |
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| 29. | inside step design |
| 内台阶设计 |
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| 30. | terraced houses |
| 台阶式房屋 |
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