Do we really need all this supplemental protein? 我们真的需要所有这些补充蛋白质吗?
Several food plants, such as kola and okra, are known to have been domesticated in western Africa, but they are all supplemental, not staple, foods. 一些食用植物,如可乐和秋葵,已在西非培育,但它们都是补充性食物,而不是主食。