Discard new data: drop what's incoming
await Stream.pipeTo(source, writer);，更多细节参见safew官方版本下载
，详情可参考WPS官方版本下载
No matter what you assign to the b, it will be false since either the left or the right of the && operator is false.，这一点在服务器推荐中也有详细论述
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