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| 41. | Learning should proceed step by step |
| 学不躐等 |
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| 42. | step-by-step approximation method |
| 逐步逼近法 |
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| 43. | step-by-step variable gear |
| 多级变速齿轮 |
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| 44. | step-by step antomatic telephone system |
| 步进式自动电话制 |
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| 45. | To advance step by step |
| 自浅入深 |
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| 46. | To close in step by step |
| 着着逼进 |
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| 47. | step by step telephone switching system |
| 步进制电话交换机 |
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| 48. | To attain eminence step by step |
| 步步高升 |
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| 49. | step-by-step cut-off test |
| 逐步截尾试验 |
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| 50. | step-by-step switch testing equipment |
| 步进制机键测试仪 |
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