n.散发；发行；排放
In addition, wetland soils are known for methane emission, a greenhouse gas. 此外,湿地散发沼气这种温室气体,是人所共知的。
New regulations are aimed at reducing the vehicle emission. 新规定的目的是要降低汽车尾气的排放。
Emission of smoke from chimneys is an offense. 在这里排放烟雾是违法的事情。
n.散发；发行；排放
n.宽恕；赦免；（疾病等）减轻；豁免；减刑
