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横坐标 : 45 phrases in 16 subjects |
Aviation | 1 |
Bridge construction | 2 |
Business | 2 |
Compressors | 2 |
Drilling | 1 |
General | 1 |
Hydroelectric power stations | 3 |
International trade | 1 |
Mathematics | 1 |
Mountaineering | 1 |
Nautical | 5 |
Oil / petroleum | 1 |
Plastics | 1 |
Space | 2 |
Technology | 20 |
Wind Energy | 1 |