Later on when times are more secure, there's trade for grain as well for everything else, but when you're settling a place in the first place, you can't rely on somebody bringing it to you.

在之后相对安定的年代,有了粮食及其他各种物品交易,但当你刚开始在某地定居时,并不能指望有人为你供给必需品

耶鲁公开课 - 古希腊历史简介课程节选

You can see in the New World with maize being important how America has become a corn dominated society, even though it's still true that we raise wheat, we raise other things in the United States, and we can import different foods, corn has become an incredibly important constituent of the diet in the U.S.

你能发现玉米在美洲大陆的重要性,那美洲是怎样变成主食玉米的社会的呢,尽管我们仍然种植小麦,在美国也种植其他粮食,而且我们能进口各种不同食物,但是玉米还是变成了,美国人食谱中不可代替的部分

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选