以下内容来自姚哲口述，经品牌棱镜编辑：
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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另一段从不同角度拍摄的视频显示，一名警员有可能就是开出致命一枪的人。
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