You can 't be positive all the time. How do you do it?

你怎么能总是那样积极乐观？你是如何做到这一点的？

youdao

Now the question you'd need to ask yourself is how do you know this didn't happen to you last night?

现在你要问自己的问题是,你怎么知道,昨晚你没发生这样的事？

耶鲁公开课 - 死亡课程节选

I don't think it makes good TV to meditate on TV, but how do you get into it?

现场表演冥想不切实际，但到底要如何做呢？

普林斯顿公开课 - 人性课程节选

How do you know something like this doesn't happen every single night, every hour on the hour, ? every minute, every second?

你怎么知道这样的事,每一晚，每个小时，每分每秒都没有发生？

耶鲁公开课 - 死亡课程节选

And a sympathetic but frustrated fan of the filmmaker's stories and characters is entitled to ask, why doesn't "How Do You Know" know what to do from scene to scene?

CNN: Review: 'How do you know' when a movie doesn't connect?

We'll go ahead and warn you that some of these aren't entirely -- how do you say?

ENGADGET: Ten predictions for the HD realm in 2009 HD

But, Jake, if we can't cut that, how do you suggest we get at the other money?

WHITEHOUSE: Press Briefing