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.新陈代谢维持生命所必需的，发生于存活细胞中或生物体中的物理和化学过程的总和。在此过程中，一些物质被分解从而为生命过程提供能量，而另一些维持生命所必需的物质则被合成
