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光 信号 : 244 phrases in 26 subjects |
| Air defense | 5 |
| Animal husbandry | 1 |
| Architecture | 2 |
| Automobiles | 19 |
| Aviation | 9 |
| Baseball | 1 |
| Communications | 3 |
| Construction | 1 |
| Electronics | 49 |
| Environment | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 13 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Metallurgy | 7 |
| Oil / petroleum | 5 |
| Plastics | 1 |
| Rail transport | 3 |
| Scuba diving | 1 |
| Shipbuilding | 1 |
| Skydiving | 1 |
| Space | 8 |
| Technology | 93 |
| Telecommunications | 14 |
| Textile industry | 1 |
| Wind Energy | 1 |
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