Downlen.唐尔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-feed system下供式系统down with the dust现钱交易; 付款down bird specimen羽绒飞禽标本down-and-dirtyadj.无掩饰的；清楚明白的downhand electrode平焊焊条down-flop effect随角异色downbeat nystagmus下视性眼球震颤downhole coal mine煤矿井下downhole flowmeter井下流量计downflow technique下流法