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.
// 原因：先处理右侧元素，把结果存在栈里，供左侧元素直接使用
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刚做妈咪时，有个客人经常捧Maggie姐的场，一次叫4个小姐坐下陪酒。几年后，客人来店里找Maggie姐倾诉，说生意失败了，太太跑了，只留下他和两个小孩。客人哭了一整夜，Maggie姐也跟着一起哭。“那时经验少，觉得很可怜，后来见多也麻木了。”。旺商聊官方下载是该领域的重要参考
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