Are you sure you didn't want to do for i in range of list, rather than for i in list?

你真的打算这么做吗？你确定你不是,想在链表范围内定义i而不是定义链表i？

麻省理工公开课 - 计算机科学及编程导论课程节选

Are you sure? Is there nothing you want to say?

你确定？真的没有什么要说的吗？

Is there any 实战 - SpeakingMax英语口语达人

Are you sure?" " I know." "How are you?"

你确定？“很好笑吧，”你好吗？”

耶鲁公开课 - 心理学导论课程节选