You MUST obey ALL the FOLLOWING rules in your implementation.
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// Write data — backpressure is enforced，这一点在safew官方下载中也有详细论述
At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.。爱思助手下载最新版本对此有专业解读
