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。
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const cur = temperatures[i]; // 当前天的温度，详情可参考夫子
GPs already set aside a chunk of their daily appointments to try to ensure patients who need an immediate appointment can get one.
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It’s problem is the lack of documentation…and a bit of misunderstanding.
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