The clay inside is carefully cut out to form a glass container.

VOA: special.2009.09.16

They would bomb it, they would burn it, they would put it in this container inside water, and see how high the water temperature raises and that would give you a sense of the number of calories that it has.

研究人员会燃烧它,放入浸在水里的量热器,然后观察水温上升了多少,我们就对这种食物热量有所了解了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选