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凹 透镜 : 38 phrases in 11 subjects |
Agriculture | 2 |
Animal husbandry | 2 |
Cartography | 1 |
Construction | 2 |
Desert science | 1 |
Electronics | 2 |
General | 4 |
Metallurgy | 7 |
Oil / petroleum | 1 |
Technology | 15 |
Telecommunications | 1 |