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free field
agric. 不受人类农业活动影响的土地
earth.sc. 自由信息区〔段,组〕
el. 自由域
met. 自由字段
nautic., tech. 自由声场
otorhinol. 开放声场
space 自由场; 未扰动场
tech. 自由; 备注栏
telecom. 自由场一
free-field
gen. 自由场; 自由字段〔信息组〕
free field: 77 phrases in 22 subjects
Air defense1
Animal husbandry1
Automobiles1
Aviation2
Bridge construction1
Desert science1
Earth sciences2
Electric machinery2
Electronics4
Engineering geology4
Explosives and Explosive Ordnance Disposal1
General3
Information technology1
Multimedia1
Natural sciences1
Nautical2
Nursing1
Oil / petroleum1
Otorhinolaryngology5
Programming1
Space7
Technology34