Photographs are produced by the action of light on film.
照片是由光线对底片发生作用而形成的。
Photographs are produced by the action of light on film.
光对底片发生作用从而产生照片。
To subject(a photographic film, for example) to the action of light.
照片是通过光对胶卷的作用而成的。
This structure has the advantages of light weight, reliable force and smooth action.
这种结构自重轻，受力合理，运行平稳。
This structure has the advantages of light weight, reliable force and smooth action.
这种结构自重轻，受力合理，运行平稳。
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