随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。
As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.
本文直接利用双膜模型图计算伴有飞速不可逆化学反应的吸收速度。
This paper deals with the direct use of the two-film model graph to compute the rate of absorption accompanied by infinitely rapid irreversible chemical reaction.
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