Walking is something you can do with others, in the sense that it can be a joint activity,a joint undertaking.

走路是一件你能和他人一起做的事，这是一个共同合作的行为和事件。

耶鲁公开课 - 死亡课程节选

because it gets you used to living with other people and you know, cooperating.

因为你就习惯了和别人住，与人合作。

与室友和睦相处 - SpeakingMax英语口语达人

Why do you manage to get some cooperation between you and your roommates even without a written contract?

为什么即便没有书面合同,你一样可以和你室友合作得愉快

耶鲁公开课 - 博弈论课程节选

And you'll do different projects with these people; you'll do a lot of things in distant learning; you'll communicate a lot with these people.

你和他们合作不同的课题;,远程学习可以做很多事;,可以经常和这些人交流。

哈佛公开课 - 幸福课课程节选

It's the fact you're getting this extra benefit from working with someone else that makes it worth while working as a team to start with.

但是现实是在你和他人合作中,你会获得额外的收益,这样合作才有价值

耶鲁公开课 - 博弈论课程节选

So, for example, if you have a joint project that you're working on, perhaps it's a homework assignment, or perhaps it's a video project like these guys, that can turn into a Prisoners' Dilemma.

比如说你和别人要进行一个合作项目,可能是家庭作业,或者像他们正在进行的视频采集项目,它能变成一个囚徒困境

耶鲁公开课 - 博弈论课程节选