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31. | double benefits |
| 双重福利 |
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32. | dual transmission |
| 双重传输 |
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33. | dual-control columns |
| 双重操纵杆 |
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34. | double projection |
| 双重投影 |
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35. | duplicate detector |
| 双重检测器 |
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36. | dual foreign exchange market |
| 双重外汇市场 |
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37. | duplication of marking |
| 双重标志 |
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38. | double porosity |
| 双重孔隙 |
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39. | dual broadcasting |
| 双重广播 |
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40. | compound discrimination |
| 双重歧视 |
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