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四角 形 : 29 phrases in 12 subjects |
Agriculture | 1 |
Automobiles | 1 |
Drilling | 1 |
Electronics | 3 |
General | 4 |
Hydroelectric power stations | 2 |
Mathematics | 1 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Shipbuilding | 3 |
Technology | 10 |
Telecommunications | 1 |