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level surface
agric.	等高面
compr.	★ 液面
kick.volley.	平坦的表面
rem.sens.	★ 水准面; 等位面
space	★ 水平面
tech.	位势面; 等势面

level surface : 52 phrases in 15 subjects

Agriculture	1
Automobiles	1
Aviation	1
Desert science	2
Electronics	6
Engineering geology	2
Explosives and Explosive Ordnance Disposal	1
Geography	1
Materials science	1
Mining	1
Nuclear and fusion power	1
Physics	4
Semiconductors	1
Space	2
Technology	27