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| 21. | expansion section |
| 扩散段扩散器 |
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| 22. | expansion eccentric |
| 膨胀偏心轮 |
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| 23. | expansion engine |
| 膨胀机;膨胀式致冷发动机 |
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| 24. | expansion staybolt |
| 伸缩撑螺栓 |
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| 25. | expansion orbit |
| 扩张轨道 |
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| 26. | expansion screw |
| 扩开螺钉;可调螺钉 |
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| 27. | expansion plate |
| 伸缩板 |
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| 28. | expansion space |
| 膨胀余量 |
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| 29. | expansion ratio |
| 充气率，发泡率膨胀率 |
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| 30. | expansion system |
| 膨胀系 |
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