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| 51. | step-by-step variable gear |
| 多级变速齿轮 |
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| 52. | The wonderful stones in Yangtse gorges are often classified :Multicolored stone, Ancient living creature |
| 三峡奇石分类：五彩石、古生物化石、象形石、雨花石、寿山石、纹理石、文案石、鱼缸石、足疗保健石。 |
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| 53. | step-by-step testing method |
| 逐步测试法 |
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| 54. | Stone Mastic Asphalt, Stone Matrix Asphalt SMA |
| 石胶泥沥青混凝土 |
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| 55. | electronic step-by-step system |
| 电子步进系统 |
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| 56. | step-by-step approximation method |
| 逐步逼近法 |
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| 57. | Be in step (/harmony; step) |
| 合拍 |
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| 58. | To advance step by step |
| 自浅入深 |
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| 59. | step-by-step automatic system |
| 步进自动制 |
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| 60. | step by step telephone switching system |
| 步进制电话交换机 |
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