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| 21. | Page Down key |
| 下滚键 |
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| 22. | Head-down indicator |
| 下视显示器 |
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| 23. | down feed system |
| 下给系统 |
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| 24. | down-conversion luminescence |
| 下转换发光 |
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| 25. | down flow carburetor |
| 下流式化油器 |
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| 26. | micropush-down stack |
| 微下堆栈 |
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| 27. | crustal down-buckling |
| 地壳下弯 |
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| 28. | Parametric down-converter |
| 参量下变频器 |
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| 29. | tears roll down |
| 泪水淌下 |
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| 30. | down stroke position |
| 下冲程位置 |
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