gaseous emission meaning in English

气态发散
气体发射
气体排出物
气体排放；气体排放物

First , no chasm or gaseous emission had ever existed in the temple at delphi
首先，德尔菲的神殿中根本就没有裂沟，亦无气体逸出。
Measurement of gaseous emissions - automatic measurement systems for single measurements of nitrogen monooxide and nitrogen dioxide
排放气体测量.一次测量一氧化氮和二氧化氮的自动测量
Heavy duty engines - measurement of gaseous emissions from raw exhaust gas and of particulate emissions using partial flow dilution systems under transient test conditions
重型机车.未处理排气的气体排放测量和瞬变试验条件下用部分流体稀释系统测量粒子排放