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Despite the headline, this isn't really a story about superconductivity—at least not the superconductivity that people care about, the stuff that doesn't require exotic refrigeration to work. Instead, it's a story about how superconductivity can be used as a test of some of the weirder consequences of quantum mechanics, one that involves non-existent particles of light that still act as if they exist.
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圖像加註文字，貿易與關稅將成為特朗普（川普）與習近平4月會晤的議題。美國白宮週六表示，總統特朗普將於3月31日至4月2日訪問中國，但中方尚未確認特朗普訪華的消息。Article InformationAuthor, 安東尼‧澤克爾（Anthony Zurcher）
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。