我的意思是，我知道一件事。

I mean, I know one thing.

youdao

但是我知道一件事，他们来波特兰学习城市种植。

But I know one thing, they came to Porltand for learning urban planting.

youdao

我知道一件事，就是要想生意兴隆，我只需满足客人的需求。

One thing I know for sure, to be good in my business I could simply just meet the expectations of my passengers.

youdao

I know you want to get on with life, and you're onto the next thing, and you are tuning out, but you hear all the click, click, click, click, click?

我知道你希望在生活上出人头地，由于弄另一件事上了，后来你又不理会了，你能全部听到嘀嘀的声音？

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so I don't know, I think it's just really cool to be able to work something from the ground up.

所以，我不知道，我就是觉得能从头开始做一件事很酷。

什么是认知科学？ - SpeakingMax英语口语达人

Common knowledge is: "I know something, you know it, you know that I know it, I know that you know it, I know that you know that I know it, etc., etc. etc.: an infinite sequence.

共同知识是指,我知道一件事,你也知道这件事,你知道我知道这件事,我也知道你知道这件事,我知道你知道我知道这件事,以此类推,一个无限的循环

耶鲁公开课 - 博弈论课程节选