今年6月底，龙先生正在房间打游戏，听到隔壁房间的母亲在打电话。他一听母亲的语气就不对劲，立即跑过去询问。母亲说打来电话的是某短视频平台的客服，说她点了一个保险链接，如果不取消，每月会自动扣费几百元。警觉的龙先生意识到可能遇到诈骗，立即劝阻了母亲。
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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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Apple has used a similar strategy before, spacing out relatively low-key refreshes over several days to generate sustained interest rather than dropping everything in a single 30- to 60-minute string of pre-recorded videos.