就在津巴布韦关上一扇门的同时，另一扇窗正在打开。
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Олег Давыдов (Редактор отдела «Интернет и СМИ»)
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.