It's not the best form of food in that they're actually very poor in protein, and unfortunately very, very rich in cyanide.

但木薯的根并不是最好的食物,因为它的蛋白质含量很少，而更不幸的是，它的氰化物含量非常，非常高。

麻省理工公开课 - 化学原理课程节选

The macro nutrients are the big constituents of food, that's protein, carbohydrate, and fat.

大量营养素是食物重要组成来源,即蛋白质,碳水化合物和脂肪

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选