代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
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.
，这一点在服务器推荐中也有详细论述
The heavy and continuous days of rainfall follow a similar pattern to the last few years of wetter winters. Six of the ten wettest since records began nearly 250 years ago have been this century, according to the Met Office.
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