離解（作用）在物理狀態下，如在壓力或溫度下的變化，或在溶劑的作用下，使分子分離為更簡單的一組原子、單原子或離子的化學過程
The chemical process by means of which a change in physical condition, as in pressure or temperature, or the action of a solvent causes a molecule to split into simpler groups of atoms, single atoms, or ions.
新陳代謝維持生命所必需的，發生於存活細胞中或生物體中的物理和化學過程的總和。在此過程中，一些物質被分解從而為生命過程提供能量，而另一些維持生命所必需的物質則被合成
The complex of physical and chemical processes occurring within a living cell or organism that are necessary for the maintenance of life. In metabolism some substances are broken down to yield energy for vital processes while other substances, necessary for life, are synthesized.
