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surface depression
bridg.constr. 沉陷
eng.geol. 地面凹陷
oil 地表下陷
tech. 凹地; 路面沉陷; 表面缩陷; 表面沉陷; 表面凹陷
surface-depression
hydroel.st. 洼地蓄水
surface -depression: 13 phrases in 3 subjects
Hydroelectric power stations2
Metallurgy4
Technology7