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-up control上行控制
down landing gear起落架
down warped basin土动陷盆地
down at the heelsadj.穿得把后跟磨掉了(邋遢的;处境穷困的)
down hand welding[化] 平焊
down-the-hole潜孔
down-conversion下变频
down-slope flow下坡气流
down-modulation下行性调节
downlock cylinder下位锁动作筒