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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近年来，与日本众多偏远地区现状相似，会津正面临人口快速萎缩、农业劳动力短缺以及耕地大面积荒废等严峻挑战。
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