《论衡·卷十二·量知篇》
 蒸 与山上的树干是同样东西，伐木做蒸，拿火来烤，用烟火的热量把它全部烤透，于是颜色光泽，在堂屋里点亮它，它的光芒照耀得很广阔，这是火灶的效用施加于它的缘故。
蒸所与众山之材干同也，以为蒸，熏以火，烟热究浃，光色泽润，爇之於堂，其耀浩广，火灶之效加也。
A steamer is just the same thing as the trunk of a tree on a mountain, gather firewood to make a steamer, fire it up, and use the heat of the fire to completely roast it through, and so its color and luster are revealed, light it up in a room, and its light can shine far and wide, this is due to the effects of the fire stove upon it.