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21. | dual Schmitt trigger |
| 双重施密特触发器 |
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22. | double taxation |
| 双重征税 |
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23. | double error |
| 双重失误 |
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24. | dual transmission |
| 双重传输 |
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25. | double denial |
| 双重否定 |
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26. | dual responsibility |
| 双重责任 |
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27. | dual enrol(l)ment |
| 双重注册 |
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28. | dual structure of economy |
| 双重经济结构 |
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29. | A double meaning. |
| 双重含义 |
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30. | dual-control columns |
| 双重操纵杆 |
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