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21. | ecological barrier |
| 生态障碍 |
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22. | sonic barrier |
| 【空】声垒, 音障 |
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23. | coastal barrier |
| 海岸沙堤 |
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24. | landscaped barrier |
| 绿化隔声屏障 |
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25. | filtration Barrier |
| 滤过屏障 |
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26. | noise barrier |
| 隔声屏障 |
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27. | Traffic barrier |
| 交通栅栏;交通障碍 |
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28. | emitter barrier |
| 发射区势垒 |
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29. | heat barrier |
| 热障 |
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30. | lattice barrier |
| 格子栏木 |
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