Mice reared in a standard cage, by contrast, not dissimilar, you might say, from a prison cell, have dramatically lower levels of new neurons in the brain.
正相反，那些养在普通笼子里的老鼠们， 你可能会说，这跟在监狱里没什么区别， 它们大脑里产生的新的脑细胞却要 少得多。