Early cylinders were completely filled with a porous filler material consisting of diatomaceous earth, charcoal, asbestos, and cement.
每个钢瓶都彻底填满了由硅藻土、木炭、石棉和水泥组成的多孔渗水材料。
Early cylinders were completely filled with a porous filler material consisting of diatomaceous earth, charcoal, asbestos, and cement.
每个钢瓶都彻底填满了由硅藻土、木炭、石棉和水泥组成的多孔渗水材料。
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