But it turns out that this ancient structure that separates us from other animals, the placenta, cannot evolve or adapt fast enough because of the rate that we're generating new chemicals that it's never seen before.
但事实证明这个古老的结构- 把我们从其他动物分开的结构，胎盘－ 并不能进化或快速适应 我们生产新化学制品的速度－ 一个前所未有的速度。