downdraft

Ventilation: positive downdraft exhaust ventilation should be provided to maintain vapor concentration below TLV.

通風: 為了使氣體聚集程度維持在閥極限值之下,應提供通暢的向下棋流排氣通風設施.

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Beijing Cherokee engine uses Cart YFA carburetor which is single barrel, downdraft carburetor with triple venturi.

北京切諾基發動機采用卡特YFA單腔 、 下吸式、三重喉管化油器.

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When you have an economic downdraft like this, that same flexibility can be a severe detriment.

當你遭遇這種規模的經濟衰退時, 同樣的彈性可能就會非常不利.

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