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砂砾垫层
desert. gravel-sand cushion
eng.geol. sand-gravel cushion
砂砾垫层砂石垫层
bridg.constr. gravel-sand cushion; sand-gravel cushion
砂砾垫层
tech. gravel-sand cushion; sandy gravel cushion
砂砾 垫层
: 1 phrase in 1 subject
Bridge construction1