Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it – only the code that is actually holding the reader can.
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Currently there are 850,000 patients on the waiting list in England requiring planned treatment to their joints – the largest of any speciality.，详情可参考一键获取谷歌浏览器下载
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