Downeyn.唐尼
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
downcomer pipen.下导管
down line load向下线路装入程序
downhole drill潜孔钻机
downstand beam肋形楼板梁
down convertern.下变频器(向下变换器)
down-Doppler下行多普勒
Down wool yarn塘种羊毛精纺纱
down-heartedadj.情绪低落的
down staircase下降电梯