2.2.3 Mermaid 类图（classDiagram）
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，详情可参考同城约会
Namespaces as visibility wallsLinux namespaces wrap global system resources so that processes appear to have their own isolated instance. There are eight types, and each isolates a specific resource.
unsigned long long length;
For our purposes, we don’t even need to chase it all the way to raw PCM which is valid avenue albeit in the realm of WEBRips and not defacto “downloaders.” We just need to find the last point in the pipeline where data is still accessible to JavaScript and that point is the MediaSource Extensions API, specifically the SourceBuffer.appendBuffer() method.