But again, that we will supply for you on the exam just in case you forget it at that moment.

但在考试中我们会给出这个值,以防你当时忘记了。

麻省理工公开课 - 化学原理课程节选

Back to this graphic again: unpredictable food supply occurred on the left but doesn't occur on the right.

再回到这张图,对左边的人而言,食物供给难以预计,而右边却并非如此

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选