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21. | isolated danger |
| 孤立障碍物 |
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22. | place a barrier |
| 安置障碍物 |
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23. | obstruction clearance |
| 障碍物间隙 |
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24. | tank oBstacle |
| 坦克障碍物 |
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25. | obstruction marking |
| 障碍物标示 |
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26. | cultural obstacle |
| 人工障碍物 |
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27. | stimulus barrier |
| 刺激障碍物 |
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28. | intervening obstruction |
| 居间障碍物 |
|
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29. | obstacle height |
| 障碍物高度 |
|
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30. | water obstacle |
| 水障碍物 |
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