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31. | step by step telephone switching system |
| 步进制电话交换机 |
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32. | electronic step-by-step system |
| 电子步进系统 |
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33. | step-by-step automatic system |
| 步进自动制 |
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34. | To close in step by step |
| 着着逼进 |
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35. | step-by-step approximation method |
| 逐步逼近法 |
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36. | step by step; one step at a time |
| 一步一步地 |
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37. | step-by-step variable gear |
| 多级变速齿轮 |
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38. | step-by-step cut-off test |
| 逐步截尾试验 |
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39. | To advance step by step |
| 自浅入深 |
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40. | Learning should proceed step by step |
| 学不躐等 |
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