水、麦芽、啤酒花和酵母是啤酒酿制过程中的主要成分。

Water, malt, hop and yeast are the main components of the beer production process.

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对于住在悬崖边的人来说，往家里运水、木头和食物是一项主要的家务。

For people in cliff dwellings, hauling water, wood, and food to their homes was a major chore.

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水是机械动力的主要来源，而到了17世纪末，人们认为仅英格兰就有2万个左右的工作磨坊。

Water was the main source of mechanical power, and by the end of the seventeenth century, England alone is thought to have had some 20,000 working mills.

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Carbohydrate has really shifted, and so people are eating more calories from carbohydrate before, sugars primarily, and that is coming primarily from added sugar, or that's at least one of the primary contributors.

碳水化合物也有明显的变化,比前人更多的从碳水化合物中摄取热量,以糖类为主,也就是说主要是添加糖类的食物,至少这是主要的来源之一

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选