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| critical zone; dangerous zone | |||
| dead zone; no-man's land | |||
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| dead zone; no-man's land | |||
| 危险地区: 17 phrases in 9 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Bridge construction | 1 |
| Ecology | 1 |
| Economy | 1 |
| Engineering geology | 4 |
| Environment | 2 |
| Space | 3 |
| Technology | 3 |
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