Three ounces of meat might have x calories or it might have y calories depending on what the meat is, how much salad dressing gets thrown on a salad, how much of this gets or that gets put in a food will vary its calorie content a lot.

三盎司的肉也许有x卡路里,也许有y卡路里,取决于肉的种类,色拉中放了多少色拉酱,在食物中有多少这个或那个,也会导致卡路里含量的差异

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选