快乐和悲伤是世界上不同文化的人都会经历的，但我们怎样得知别人是快乐还是沮丧呢？

Joy and sadness are experienced by people in all cultures around the world, but how can we tell when other people are happy or despondent?

youdao

尽管在这将成为可能之前有一些问题需要解决，但我们肯定可以梦想一个世界，在那里科技使千百万人的生活更容易和更安全。

Although there are some problems to solve before this will be possible, we can certainly dream of a world where technology makes life easier and safer for millions of people.

youdao

以一种新的方式想象这个世界，尽管你可能认为自己的创造性想象力有限，但我们都有潜力以一种全新的方式来看世界。

Imagining the world in a new way, and despite what you may believe about the limits of your own creative imaginations, we all have the potential to imagine the world in an absolutely new way.

youdao

How we see the world is often confusing and befuddled but what we know can clear things up.

我们所看到的世界充满了不解与困惑,但我们的知识却能帮助我们拨开迷雾

耶鲁公开课 - 心理学导论课程节选

I really care about... it sounds really cheesy, but I would like to live in a better world,

我关注的是……这也许听起来挺华而不实的，但我希望我们的世界更加美好，

为了更美好的世界 - SpeakingMax英语口语达人

But we don't think anywhere in the world there's any society that's perfectly just.

但我们认为世界上无论哪里,都不存在完全正义的社会

耶鲁公开课 - 死亡课程节选