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阀 动 作 : 40 phrases in 11 subjects |
Automobiles | 6 |
Aviation | 4 |
Compressors | 1 |
Electronics | 4 |
Nuclear and fusion power | 1 |
Oil / petroleum | 1 |
Oil processing plants | 1 |
Rail transport | 1 |
Refrigeration | 1 |
Space | 9 |
Technology | 11 |