Over the last millennia, our ancestors have pursued this in basic ways, for instance, by improving milk production from cows and making a wild grass called teosinte into edible corn.

在过去的几千年里， 我们的祖先一直在以基本的方式追求这一点，例如，通过提高奶牛的产奶量， 以及将一种叫做类蜀黍的野草制成可食用的玉米。