await Stream.pipeTo(source, writer);
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，这一点在91视频中也有详细论述
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
RCS 信息的端到端加密扩展到 iPhone 与安卓设备之间，此前仅 iPhone 之间可用，但需运营商支持；，更多细节参见爱思助手下载最新版本