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gravel-sand cushion
archit. 砂石垫层
bridg.constr. 砾砂垫层; 砂砾垫层砂石垫层
desert. 砂砾垫层
tech. 砂砾垫层
gravel -sand cushion
: 6 phrases in 4 subjects
Bridge construction2
Desert science1
Engineering geology2
Technology1