D 開頭單詞
downbend 洼地
downbeat n.下拍(樂隊(duì)指揮向下的手勢(shì))；停滯adj.憂郁的；悲觀的；不強(qiáng)烈的
downbeam 順流方向
downalong adv.順沿而下(去遠(yuǎn)處)
downaileron n.下偏副翼
downager n.外老里嫩族（指上了年紀(jì)但生活態(tài)度卻與年輕人同步的人）
down-wash 下沖(氣)流
down-turn n.下降；衰落
down-to-earth effort 踏實(shí)苦干
down-to-earth adjective [商業(yè)]腳踏實(shí)地的人
down-to-earth adj.實(shí)際的；謙遜的
down-the-line ad.徹底地a.徹底的
down-the line shot [體育]直線球
down-stream tube [經(jīng)濟(jì)學(xué)]下游管
down-stream product [商業(yè)]下游產(chǎn)品
down-stream cycle 氣流下降期
down-slip-fault 下落斷層
down-sizing n. 縮小規(guī)模；裁減人員；小型化