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| 碰撞危险 | |||
| 碰撞风险 (航天器在轨道运行时受到空间碎片撞击的风险) | |||
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collision risk : 5 phrases in 4 subjects |
| Aviation | 2 |
| Business | 1 |
| Rowing | 1 |
| Technology | 1 |
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