Why are pot holes round?

为什么地上的坑是圆形的？

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Like most all hutong denizens, Mrs. Wang and her husband, Liu Xingye, have weathered decades of Beijing winters by feeding round bricks of coal into a squat pot-bellied stove.

和绝大多数有在胡同居住经历的北京居民一样，以前王女士和她丈夫刘兴业（音）在冬天以烧煤球取暖。

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It USES two round containers made of clay. A smaller pot is placed inside a larger one.

该系统使用两个由黏土制成的圆形容器，把小罐子放到大罐子里面。

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Learned shaykhs discussed whether the effects of coffee were similar to those of alcohol, and some remarked that passing round the coffee pot had something in common with the circulation of a pitcher of wine, a drink forbidden in Islam.

BBC: Coffee and qahwa: How a drink for Arab mystics went global

And whoever loses their bread in the fondue pot buys a round of drinks for the table.

WSJ: In Search Of: Switzerland's Best Fondue

In the second round, the winners of the previous round (wealthy businessmen and their heirs) have a pot of money that they distribute among potential causes.

FORBES: Does the Left Favor A More Activist Government?