Three As三个自动化threenum.三n.三；三个adj.三个的three phase motor三相电动机three deck vessel三层甲板船three layer diode三层二极管threephase switch三相开关three gold medals三金three-room flat三室一套的房间three period nets三期网three-gap model三缺口模型three units array三元阵three finger rule[电] 三指定则