The technology is being used to make very precise changes that allow us to study the way that these changes in the cell's DNA affect either a tissue or, in this case, an entire organism.
这技术已经被用来 实现非常精准的改变， 使我们能够研究细胞DNA里的变化， 不论是对一个组织或 像这个案例中的, 整个有机体。