2. 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。
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3. 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.