调整范围 : 29 phrases in 15 subjects |
Agriculture | 2 |
Air defense | 1 |
Automobiles | 2 |
Aviation | 1 |
Bridge construction | 1 |
China | 1 |
Electric machinery | 3 |
Finances | 1 |
Hydroelectric power stations | 2 |
Metallurgy | 3 |
Oil / petroleum | 1 |
Piezoelectric crystals | 1 |
Space | 1 |
Technology | 8 |
Telecommunications | 1 |