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21. | A double meaning. |
| 双重含义 |
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22. | compound catenary |
| 双重键线|双重悬键线 |
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23. | Serving two purposes;twofold. |
| 为双重目的服务的;双重的 |
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24. | dual Schmitt trigger |
| 双重施密特触发器 |
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25. | double taxation |
| 双重征税 |
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26. | dual enrol(l)ment |
| 双重注册 |
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27. | double error |
| 双重失误 |
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28. | dual responsibility |
| 双重责任 |
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29. | double denial |
| 双重否定 |
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30. | dual structure of economy |
| 双重经济结构 |
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