1. 散发;释放;放射
An emission of something such as gas or radiation is the release of it into the atmosphere.
1. the act of emitting
causing to flow forth
Synonym: emanation
2. the occurrence of a flow of water (as from a pipe)
3. any of several bodily processes by which substances go out of the body
e.g. the discharge of pus
4. the release of electrons from parent atoms
5. a substance that is emitted or released
Synonym: discharge