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areal distribution | |||
area distribution | |||
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regional distribution |
区域 分布 : 16 phrases in 12 subjects |
Air defense | 1 |
Animal husbandry | 1 |
Desert science | 1 |
Earth sciences | 1 |
Ecology | 2 |
Electronics | 2 |
Environment | 1 |
Genetics | 1 |
Oil / petroleum | 2 |
Space | 1 |
Technology | 2 |
Telecommunications | 1 |