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sand and gravel
earth.sc. 砂和砾石
geol. 砂子和砾石
hydroel.st. 砂砾石
tech. 沙砾 (石)
sand and gravel
: 54 phrases in 8 subjects
Construction1
Earth sciences2
Ecology6
Electronics2
Engineering geology3
General3
Hydroelectric power stations5
Technology32