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.
Владимир Зеленский. Фото: Thilo Schmuelgen / Reuters
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1949年，杜耀豪的外祖母曾想将年轻的林木通接到越南生活，但时局突变，计划永远搁置。林木通终身留在澄海，贫苦务农。2009年临终前，他嘱咐妻子保管好自己的退伍证，如果他的外甥来找他，就拿这个证，和他们认亲。