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What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
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「該怎麼說呢？在奧運贏得獎牌對每位運動員而言都是改變人生的經歷。五度奪牌的難度更是呈指數級增長——每面獎牌對我而言同樣艱辛，但外界的期待值卻不斷攀升，對吧？」，详情可参考爱思助手下载最新版本