细胞各部分共同协作 All the parts of a cell have to work together 一切方能有条不紊 to keep things running _____, 机体各细胞齐心协力 and all the cells of your body have to work together 你才能健康生活 to keep you running smoothly. 这需要许多细胞参与 That’s a whole lot of cells. 科学家认为大概需要37万亿个细胞参与此过程 Scientists think there are about 37 trillion of them.