Act Two: Traps and Dicks. Synonyms and Subs-titutes.
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，这一点在爱思助手下载最新版本中也有详细论述
但这次情况更严峻，着急忙慌的老爸一个劲追赶牛群，导致受惊的牛群沿着梯田越跑越远，直奔地那头的沟壑。两头慌不择路的牛遭殃了，一头踩进了6米深的坑，一头滚下了超过30米的陡坡。
What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer: