A plastic membrane serves as selective diffusion barrier.

一层塑料薄膜起着选择性渗透屏障的作用。

V-ERG. (使）（知识、消息等)传播；（使）散布；（使）普及. If something such as knowledge or information is diffused, or if it diffuses somewhere, it is made known over a wide area or to a lot of people.
※We should put aside and postpone all other reforms; that we  have but one task-----the istruction of the people, the diffusion of education, the ecourgement of science----on that day a great step will have then been taken in our rgenerion.Leon Gambetta, French educator——我 们应该把一切改革先放下。我们只有 一项任务，就是教育人民，普及知识、倡导科学。这一天到来之时，便是我们振国兴邦之日。法国教育  爱甘必大  L

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