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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.
，这一点在WPS下载最新地址中也有详细论述
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居民委员会成员可以兼任下属委员会的成员。居民较少的居民委员会可以不设下属委员会，由居民委员会的成员分工负责有关工作。
这种重资产模式在初期投入巨大，但在价格战进入白热化的阶段，它便构成了难以复制的成本护城河。