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很多机会 | |||
露地; 大田; 旷野 | |||
空旷地带; 无人防守区; 无人防守地区 | |||
开放区 |
open field : 30 phrases in 13 subjects |
Advertising | 1 |
Agriculture | 7 |
Animal husbandry | 2 |
Architecture | 2 |
Automobiles | 1 |
Ecology | 1 |
Economy | 3 |
Electric machinery | 1 |
Explosives and Explosive Ordnance Disposal | 3 |
Life sciences | 1 |
Metallurgy | 4 |
Sports | 1 |
Technology | 3 |