Okay, so 2500 calories one day; 1400 another.

一天摄入2500卡路里,另一天则仅摄入1400卡路里

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

She starts at the beginning of her day and goes through task after task, chore after chore, project after project

她从一天的开始说起，从一个任务说到另一个任务，从一件杂活说到另一件杂活，从一个项目说到另一个项目。

It sounds like 课堂 - SpeakingMax英语口语达人

One person might be a little low one day, another person might be high, a lot of people might-- you might happen to have captured them on an average day, but overall it averages out, so you get a representative sample.

一个人可能某一天少吃些,另一个人可能多吃些,很多人都会这样,你可能正好得出人们,平均每天的摄入量,但把它的整体平均一下,就得到有代表性的结果

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选