You can't take land that everybody is sharing in common.

你不能掠夺大家共同使用的公用土地。

耶鲁公开课 - 公正课程节选

Or if someone makes a mess in a, in a common area, they are expected to clean up that mess.

如果有人把公用区域弄脏了，那他就要负责打扫干净。

有趣的室友们 - SpeakingMax英语口语达人

That creates all sorts of social consequences that we'll talk about sustainability, with shipping water long distances, all the plastic involved, people's distrust of public water systems that's unfounded, and things like that are very interesting and have big public health consequences.

这就产生了很多社会问题,比如我们将要谈到的饮水污染问题,饮用水在长途运输的过程中,会受到各种塑料污染,还有人们对公用自来水系统,毫无理由地不信任,类似这些现象都很有趣,而且会导致重大的公共健康后果

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, that's his gift to us: the Lewis structure, and the idea that you could share electrons and form a covalent bond.

这就Lewis给我们的礼物，Lewis结构，你能够通过公用电子,形成共价键。

麻省理工公开课 - 固态化学导论课程节选

and there's one public community rest room for girls and guys.

有一个男女公用的洗手间。

住宿环境怎样？ - SpeakingMax英语口语达人