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| 1. | runway obstruction |
| 跑道障碍 |
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| 2. | Underwater Obstruction |
| 水底障碍 |
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| 3. | obstruction fading |
| 障碍衰落 |
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| 4. | obstruction cocycle |
| 障碍闭上链 |
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| 5. | obstruction warning |
| 障碍报警 |
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| 6. | obstruction gauge |
| 障碍规 |
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| 7. | obstruction method |
| 障碍法 |
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| 8. | tertiary obstruction |
| 第三障碍 |
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| 9. | obstruction box |
| 障碍箱 |
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| 10. | homotopy obstruction |
| 同伦障碍 |
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