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.
1L Qwen3, d=3, 4h/1kv, hd=2, ff=2，详情可参考91视频
。业内人士推荐搜狗输入法2026作为进阶阅读
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