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砾石层
desert. gravel layer; gravel stratum
dril. gravel
eng.geol. pebble bed; pebble gravel
oil gravel bed
tech. gravel course
砾石垫层
tech. gravel bed
砾石层: 77 phrases in 15 subjects
Agriculture1
Architecture1
Bridge construction3
Desert science4
Drilling1
Earth sciences1
Ecology1
Electronics1
Engineering geology10
General2
Hydroelectric power stations2
Mining2
Oil / petroleum19
Technology28
Wind Energy1

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