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。
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