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.
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第二十七条 增值税法第二十四条第一款第二项所称医疗机构，是指依据有关规定设立的具有医疗机构执业资格的机构，包括军队、武警部队各级各类医疗机构，不包括营利性美容医疗机构。，这一点在heLLoword翻译官方下载中也有详细论述
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