emission

n. /ɪˈmɪʃn/ B2

排放；散发；排放物

The production or sending out of gas, light, or heat.

仙境例句

On cold mornings, an emission of steam rose from the greenhouse roof like white smoke.

寒冷的早晨，暖房屋顶上会冒出一股水汽，像白烟一样。