Howeer, metabolic pathways are actually labyrinths of interconnected garden hoses with complicated flow patterns. 然而，事实上，代谢途径如同是由众多错综复杂浇水管道组成的迷宫，它们有着复杂的流动参数。
The metabolic pathways of organic compounds have often been delineated by using a radioactively labeled substrate and following the fate of the label. 有机化合物的代谢途径经常用放射性标记的底物并对其进行跟踪来描述。
