emit
/ɪˈmɪt/verb
1emitted, emitting
with obj. produce and discharge (something, especially gas or radiation)排放, 散发（尤指气体、辐射物）：coal-fired power stations continue to emit large quantities of sulphur dioxide.
燃煤火力发电站继续排放着大量的二氧化硫。
1.1
- make (a sound)发出（声音）：
she emitted a sound like laughter.
她发出了一种类似于笑声的声音。
词源
early 17th cent.: from Latin emittere, from e- （variant of ex-） 'out of' + mittere 'send'.