downedadj.击落的；击倒的动词down的过去式和过去分词.downadv.向下prep.沿着 ... 而下adj.向下的；消沉的；无礼的n.绒毛；汗毛v.击倒；打败；吞下；被抑制down line transmission下行线路传输Downrange Support Ship下靶区支援船只down filling materials羽绒填充料down-hole flow field井底流场downwhole electrodrill孔底电钻downhole control valve井下控制阀down-train direction下行方向down-draft sintering吸风烧结down-flow evaporator降膜蒸发器downhole gas separator井下气体分离器