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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Rochdale, Greater Manchester
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2025年，全国省际贸易销售额占全部销售额的比重升至41%，跨省跨区交易电量占全国电力市场交易电量的比重升至24%。社会物流总费用与GDP的比率降至13.9%，创有统计以来的最好水平。这“两升一降”，反映要素实现更大范围优化配置，市场交易成本不断降低。