That one's not so obvious. So let's think about this for a second. To sort a list in linear time, would say, I have to look at each element in the list at most a constant number of times.

所以让我们来思考一会,要在线性时间能排序，列表里每个元素最多被使用常数次,不一定是一次，对吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

But for me personally, it doesn't have to be first class.

但是对我个人而言，不一定需要最上乘的。

喜欢巧克力吗？ - SpeakingMax英语口语达人

These kinds of fats are not necessarily bad, and so things like olive oil in the diet tends to be protective and may explain some regional variations in rates of heart disease.

这些脂肪就不一定有害,所以饮食中橄榄油之类的对身体是有益的,这也解释了地域间心脏病发病率的差异

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

and they reply in German, "Yes, I'm French," that doesn't--language doesn't necessarily tell you how people feel about their identity. Some sage once said, I don't know who it was, but I love this expression, that a language is a dialect with a powerful army.

然后他们用德语回答,"我是法国人",不一定--语言不一定能代表,对自己的身份认同,有个哲人说过,我忘了是谁,但我特喜欢这句,说语言就是有强大军队撑腰的方言

耶鲁公开课 - 1871年后的法国课程节选