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随时而变 : 11 phrases in 8 subjects |
| Aviation | 1 |
| Business | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 3 |
| Hydroelectric power stations | 1 |
| Plastics | 1 |
| Radio | 1 |
| Wind Energy | 1 |
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