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| yearly variation | |||
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年 变量 : 14 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Desert science | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 1 |
| Information technology | 1 |
| Technology | 6 |
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