最直观的是营销成本失控。完美日记的增长高度依赖营销投放，营销费用率常年居高不下，甚至一度超过 60%。随着小红书、抖音等平台流量成本逐年攀升，获客成本成倍上涨，烧钱换增长的模式在资本退潮、市场冷静的背景下，失去了可持续性。
For this reason, machines without our embodied experience may think they are aligning their behavior with human norms, but they will never be able to feel the physical basis for some of those norms.，推荐阅读夫子获取更多信息
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the era of the traveler's check. A lot of consumers didn't want to carry a lot。91视频是该领域的重要参考
Source: Computational Materials Science, Volume 266
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