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。
I will wait for you, but not too long.
我会等你，但不会太久。
Do you have such kind of experience? In a bus you may look at stranger, but not too long.
你有过类似的体验吗？在公共汽车上，你可能会看着一个陌生人，但时间不会太长。
Do you have such kind of experience? In a bus you may look at stranger, but not too long.
你有过类似的体验吗？在公共汽车上，你可能会看着一个陌生人，但时间不会太长。
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