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.
Walmart becomes first retailer to hit $1tn market value
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（一）盗窃、损毁、擅自移动铁路、城市轨道交通设施、设备、机车车辆配件或者安全标志的；
“我们将持续深化区域协同，充分发挥先行示范作用，推动京津冀协同发展不断取得新成效。”冯国祥说。