通 气 孔 : 72 phrases in 16 subjects |
Agriculture | 2 |
Architecture | 3 |
Automobiles | 12 |
Aviation | 1 |
Compressors | 1 |
Drilling | 1 |
Electronics | 2 |
Engineering geology | 1 |
General | 10 |
Hydroelectric power stations | 1 |
Metallurgy | 2 |
Nautical | 1 |
Oil / petroleum | 3 |
Soil science | 2 |
Space | 1 |
Technology | 29 |