化学：membrane 和 film 的区别？ - 知乎 membrane一般是指允许或阻止物质通过的膜（起分离或隔绝的作用），film一般不强调这种作用 A membrane is a selective barrier at times it is also a outer covering of cell or cell organelle that allows the passage of certain constituents and retains other constituents found in the liquid