And isn't that clear already from their colors, the material that they're made of Gold and silver, these colors marked them as fashioned, precious objects, inorganic, and in all these ways beyond time and nature, growth or decay.

从它们的颜色上很容易知道，制作它们的材料,金银说明它们是,特制的珍贵的物件，非自然生长的，这些都是超越时间自然,不会生长或衰亡。

耶鲁公开课 - 现代诗歌课程节选

If you think about what ancient food gathering habits used to be like, you see things like this where people are out gathering food that is growing naturally, and you can think about what would-- what sort of conditions this would create and what kind of hardships it would create.

如果你想知道古代食物采集的习惯,请看这张图,人类都在野外采集自然生长的食物,你可以设想到,条件有多恶劣,生存有多艰难

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选