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| 分布特征 | |||
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distribution characteristics : 14 phrases in 8 subjects |
| Agriculture | 1 |
| Business | 1 |
| Earth sciences | 2 |
| Ecology | 3 |
| Electric machinery | 1 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 4 |
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