three plyadj.三层的(三股的;三夹板)
threenum.三n.三;三个adj.三个的
three-high bloomer三辊开坯机
three-pointed arch尖顶拱
three grand channels大三通
three-jointed pike三节棍
three-phase region三相区
three-group theory三群理论
three heading system三平巷掘进法
three charges system三电荷系统
three- point hitch三点悬挂
three-phase design三阶段设计