单词	pokelogans
释义	同pokelogan
随便看	double-valued function double-valued nonlinearity double valve double valves double variation double variation method double variety double vault double v belt double v butt joint double-v butt joint double v clutch double-vee double velvet double v engine double venturi double vernier double-v groove double v groove weld double-v groove weld double virginals double vision double-voltage motor double voltage rating double volute