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21. | nominative introduction |
| 主格引入 |
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22. | plant introduction |
| 植物引入 |
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23. | pull-in frequency |
| 引入频率 |
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24. | leading in cable |
| 引入电缆 |
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25. | introduction of air |
| 引入空气 |
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26. | introduced cross |
| 引入杂交 |
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27. | lead 1-in plate |
| 引入板 |
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28. | leading through |
| 引入套管 |
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29. | introduction programme |
| 引入程序 |
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30. | calling indicator |
| 引入指示 |
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