电影业从“默片”向其他方向的转变始于上世纪20年代后期。
The shift of the industry away from 'silent' films began during the late 1920s.
从20年代起，针对美国电影对国际电影市场的垄断，世界各国制定了严格进口法，以保护国内电影业。
From the 1920s onward, American films so monopolized the international film market that severe import restrictions were imposed on everywhere to protect domestic film industry.
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