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天然地面
bridg.constr.
natural ground surface
eng.geol.
natural ground
tech.
open ground
;
original ground
天然〔无保护层的〕地面
gen.
open ground
天然 地面:
10 phrases
in 5 subjects
Earth sciences
1
Geophysics
1
Hydroelectric power stations
1
Mining
1
Technology
6
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