emission
noun uk/iˈmɪʃ.ən/ us/iˈmɪʃ.ən/
C1 [ U ]（气体、热量、光线等的）排放，散发，射出
the act of sending out gas, heat, light, etc.
Environmental groups want a substantial reduction in the emission of greenhouse gases. 环保组织要求切实减少温室气体的排放量。
C1 [ C ]排放物;散发物
an amount of gas, heat, light, etc. that is sent out
carbon dioxide emissions 二氧化碳的排放