tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
Анна Габай (Редактор отдела «Силовые структуры»)
。关于这个话题，51吃瓜提供了深入分析
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被分装售卖的山姆蛋糕。南方周末记者贾梦雅｜摄
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