restricted area : 19 phrases in 11 subjects |
Aviation | 3 |
Basketball | 2 |
China | 1 |
Electric machinery | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
Fishery fishing industry | 3 |
Mechanics | 1 |
Nuclear and fusion power | 1 |
Plastics | 2 |
Space | 3 |
Technology | 1 |