Follis in Latin referred to bellows which were effectively bags of air that could be repeatedly squeezed, resulting in a blowing of oxygen on the hot coals of a fire.
拉丁语里的follis指风箱，即一种可以反复挤压的气囊，用来将氧气吹到烧红的煤炭上。
Then set the empty pot on the coals till it becomes hot and its copper glows so its impurities may be melted and its deposit burned away.
把锅倒空坐在炭火上，使锅烧热，使铜烧红，熔化其中的污秽，除净其上的锈。
Then set the empty pot on the coals till it becomes hot and its copper glows so its impurities may be melted and its deposit burned away.
把锅倒空坐在炭火上，使锅烧热，使铜烧红，熔化其中的污秽，除净其上的锈。
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