Cǐpiān jiǎngshù le yīgè guānyú yǒuyì yǔ bèipàn de gùshi.
This film tells a story about friendship and betrayal.
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此片 is a formal or written-language expression, common in film reviews, press releases, and promotional materials. In everyday speech, 这部电影 is the usual way to say 'this movie'.