是因为老鼠食物摄取量由多种因素决定，包括食物味道如何，实验前老鼠的饥饿程度以及食物本身的油腻感和饱食感等等。
Because food intake can be driven by a variety of factors including how it tastes, how hungry the mice were beforehand and how 'sated' or full the food made them feel.
富裕和贫寒、光荣和默默无闻、权力和屈服、强壮和软弱、健康和疾并教养和无知、工作和闲暇、饱食和饥饿、道德和罪恶，都不过是较高或较低程度的自由罢了。
Wealth and poverty, health and disease, culture and ignorance, Labour and leisure, repletion and hunger, virtue and vice, are all only terms for greater or less degrees of freedom.
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