downdraft ['daʊnˌdrɑ:ft]

例句:

• Ventilation: positive downdraft exhaust ventilation should be provided to maintain vapor concentration below TLV.
  通风: 为了使气体聚集程度维持在阀极限值之下,应提供通畅的向下棋流排气通风设施.
  
• Beijing Cherokee engine uses Cart YFA carburetor which is single barrel, downdraft carburetor with triple venturi.
  北京切诺基发动机采用卡特YFA单腔 、 下吸式、三重喉管化油器.
  
• When you have an economic downdraft like this, that same flexibility can be a severe detriment.
  当你遭遇这种规模的经济衰退时, 同样的弹性可能就会非常不利.
  
• Others say the recent downdraft has been exaggerated in part by thin end-of-year trading.
  来自WSJ
• If there's a strong updraft, you're not far from a strong downdraft.
  来自SA