So you could have--be consuming fat that is in itself good for heart health let's say, or maybe protective against cancer in some ways, but it's also adding calories to the diet, so you want to have the optimal amount of fat and not over-consume it because of the calories.

所以你可能是在食用,有益于你心脏健康的脂肪,打个比方,又或是在某种程度上可以抗癌,但它也给你的饮食增加了热量,因此为了减少热量应该食用适量,而非过量的脂肪

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The amount of water that you need to have the optimal sort of concentrations of things is determined by how much urine your kidneys produce and how much they excrete each day.

为了保持体内物质的理想浓度,所需的水量,取决于肾脏每天产生,以及排出体外的尿量

耶鲁公开课 - 生物医学工程探索课程节选