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| red zone | |||
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红环 : 34 phrases in 16 subjects |
| Compressors | 1 |
| Dermatology | 6 |
| Desert science | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Environment | 1 |
| General | 2 |
| Geology | 1 |
| Latin | 3 |
| Life sciences | 1 |
| Nautical | 1 |
| Pest control | 2 |
| Pharmacology | 3 |
| Shipbuilding | 2 |
| Technology | 4 |
| United Nations | 4 |
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