Then they amputated a small piece from each flatworm.

然后他们把每个涡虫切成小块。

The flatworm relies upon a population of stem cells to accomplish this remarkable feat;

扁形虫（涡虫是一种扁形虫）要靠大量的干细胞才能完成这种非凡的技艺；

After all, the flatworm planaria does just fine with eyes that are arguably not as good.

从上可知，扁形涡虫的眼睛比理论上要好得多。

A planarian is a flatworm, one of the lowest life-forms that can be considered an animal.

真涡虫是一种扁虫，一种可以被认为是动物的最低级生命形式。

The tiny flatworm Planaria can be cut into as many as 32 pieces, each of which will grow into a whole new animal complete with eyes, mouth and internal organs.

涡虫类扁虫能被切成三十二片，而每一片都会长成一只全新的动物，眼睛、嘴和内脏俱全。