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轮齿隙 : 20 phrases in 11 subjects |
Automobiles | 2 |
Compressors | 2 |
Computer numerical control | 1 |
Construction | 1 |
Hydroelectric power stations | 1 |
Mechanics | 2 |
Metallurgy | 1 |
Oil / petroleum | 2 |
Space | 1 |
Technology | 6 |
Wind Energy | 1 |