It can be a very loose film, dust like in appearance and texture that can be readily wiped off to a tight pertinacious film that requires scraping with a sharp instrument to be removed.
相对于需要用尖锐的工具刮除的紧固的膜来说，它是非常松散的膜，外表和结果上看来象灰尘，很容易擦去。
It can be a very loose film, dust like in appearance and texture that can be readily wiped off to a tight pertinacious film that requires scraping with a sharp instrument to be removed.
相对于需要用尖锐的工具刮除的紧固的膜来说，它是非常松散的膜，外表和结果上看来象灰尘，很容易擦去。
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