Stem cells are immature cells that give rise to multiple cell types, while also replenishing themselves through a process of self-renewal.
干细胞是不成熟的细胞，可以分化成多种多样的细胞类型，在自我更新的过程中，它们也会自我补充。
2
There is hope that damage to the spinal cord and brain will one day be treatable using stem cells (i. e. immature cells that can develop into different cell types).
有希望在将来的某一天用干细胞治疗脊髓和大脑损伤（例如能够分化为不同细胞类型的未成熟细胞）。
3
They next extracted DNA from a dog oocyte (an immature female reproductive cell prior to fertilization) and injected the fluorescent-modified dog cells into it.