Because in essence what it means is you can take a cell, which is a pluripotent stem cell, which is like a skier at the top of a mountain, and those two skiers become two pluripotent stem cells, four, eight, 16, and then it gets so crowded after 16 divisions that those cells have to differentiate.
因为从本质上说 这就意味着我们可以取一个 多能干细胞 好比山顶上的滑雪者 两个滑雪者就是两个多能干细胞 分裂成4个，8个，16个 然后变得越来越拥挤 16次分裂之后 这些细胞不得不进行分化