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| 31. | nominal step value |
| 标称台阶值 |
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| 32. | dynamic terrace precision |
| 动态台阶精度 |
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| 33. | landscape terrace |
| 园景台阶 |
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| 34. | Mind (ie Don't trip over) that step! |
| 小心那个台阶! |
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| 35. | inside step design |
| 内台阶设计 |
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| 36. | cylinder ridge reamer |
| 汽缸台阶铰刀 |
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| 37. | flat-back stope |
| 逆台阶工作面 |
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| 38. | terraced houses |
| 台阶式房屋 |
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| 39. | bench excavation |
| 台阶式挖掘 |
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| 40. | dock-wall altar |
| 干船坞台阶 |
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