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| aeon | |||
| 亿年: 14 phrases in 9 subjects |
| Architecture | 1 |
| Economy | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 3 |
| Geology | 4 |
| Hydroelectric power stations | 1 |
| Lighting other than cinema | 1 |
| Space | 1 |
| Technology | 1 |
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