词汇	定样
释义	定样 dìngyàng〔econ.〕random sample；stratified sample
随便看	underwater vehicle under water vehicle underwater vehicle control system underwater vehicle-manipulator system underwater vehicles underwater vehicle simulation underwater vehicles subjected Underwater vehide underwater velocity underwater vertical launching underwater vessel UNDERWATER vessels or submarines underwater vessel, towed underwater videoconverter underwater video converter underwater video recorder underwater vidiocon underwater viewer under-water viewer Underwater Viewing Module underwater viscosity underwater visibility underwater vision underwater volume underwater vortex