[, ]harmful gas, etc. that is sent out into the air排放物；散发物；排泄物◆emissions from vehicles/power stations汽车／发电站排放物◆They aim to reduce carbon dioxide emissions by 20% by 2012.他们的目标是到 2012 年将二氧化碳排放量降低 20%。 [] the production or sending out of harmful gas, etc.（有害气体等的）发出，散发，排放，射出◆low emission cars低排放汽车