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| 21. | dynamic terrace precision |
| 动态台阶精度 |
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| 22. | ascend the steps |
| 登上台阶 |
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| 23. | calibration step |
| 校准台阶 |
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| 24. | inside step design |
| 内台阶设计 |
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| 25. | Ruth listened and started nervously at every passing footstep. |
| 露丝谛听着，每次有脚步声过去她就心惊肉跳。 |
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| 26. | striding the stage. |
| 大踏步走过台阶 |
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| 27. | The Thirty-nine Steps |
| 国防大秘密(39台阶)；三十九级台阶 |
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| 28. | landscape terrace |
| 园景台阶 |
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| 29. | Machining of step dimension |
| 台阶尺寸加工 |
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| 30. | flat-back stope |
| 逆台阶工作面 |
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