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

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

That is to say, the three parts of the cities, workers, auxiliaries, guardians, each of them all work together and each by minding their own business, that is doing their own job, out of this a certain kind of peace and harmony will prevail.

也就是说，城市的三个部份，工人，后备军人及守护者，每人都紧密合作,且各司其职，只管他们自己的事，在此以外,特定的和平及和谐将照管一切。

耶鲁公开课 - 政治哲学导论课程节选