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It has figured out the best length for free teasers in various niches: long enough to pique the user's interest, but not too long to keep him from paying for more.
它研究得到了不同类型的预览片的最佳长度：长到足以挑起观看者的兴趣，但又不能太长以致他不会付钱购买全片。
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