And they go in the base of that pyramid, and they drift up; they're passed up that way, on to predators and on to the top predators, and in so doing, they accumulate.
它们进入到食物链金字塔的底部， 并不断向上，经过食物链， 到达肉食动物和顶端肉食动物这里。 这样的话， 就堆积起来了。