downern.镇定剂；令人沮丧的人或事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 cushion羽绒靠垫down-tonern.下位修饰down-cyclen.下降的周期Down disease唐氏病downfaultingn.下落断层down current下降气流downsampling向下采样down mittens羽绒手套down clothes羽绒服down feathern.绒羽