No one seems to know for sure.

VOA: special.2010.06.27

It's been disputed and one doesn't know for sure.

尽管这点还存在争议。

耶鲁公开课 - 文学理论导论课程节选

it's Shopbot for people, you know, make sure things sell,

对人们来说，那就是个比价器，确保东西卖得出去，

在布鲁明戴尔百货 - SpeakingMax英语口语达人

We know for sure Greeks and barbarians, and everybody came to Delphi, and when you came to Delphi and you were going to consult the it was hard, there were a lot of people, a long line, so there was a waiting issue.

我们可以肯定希腊人和蛮族人,都去了特尔斐,当人们到了特尔斐时,就会去请示神谕,这事情很难做,因为人非常多,会有很长的队伍,因此等待是个大问题

耶鲁公开课 - 古希腊历史简介课程节选

As I'm sure you know, Socrates was put on trial, condemned to death for corrupting the youth of Athens-- and perhaps, among other things, for arguing philosophy with them.

想必你们都知道,苏格拉底被人指控,以教唆雅典青年的罪名,被判处死刑,也许,罪名还包括,和青年们讨论哲学

耶鲁公开课 - 死亡课程节选

Let's assume you know that for sure.

假设你对此确信无疑。

耶鲁公开课 - 公正课程节选