translation.en: Now the first part, the first problem, is relatively easy -- it's not easy at all -- but it is something that has been approached gradually in neuroscience.
translation.zh: 现在我们来说第一部分，第一个问题 这相对来说比较简单——但是它一点都不简单—— 但是在神经系统科学中它正在被慢慢解决。