translation.en: Now unlike a human-designed computer, where there's a fairly small number of different parts -- we know how they work, because we humans designed them -- the brain is made out of thousands of different kinds of cells, maybe tens of thousands.
translation.zh: 不同于人类设计的电脑 那种由较少的不同元件组成的-- 我们了解它们如何工作，因为是我们人类设计出了它们-- 大脑由上千种不同的细胞组成 也许是上万种