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.
第七十一条 有下列行为之一的，处一千元以上三千元以下罚款；情节严重的，处五日以上十日以下拘留，并处一千元以上三千元以下罚款：
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Configurable latency streaming
Blocks form chains, which are called “Blockchains.”