Let me introduce you to what I call the PCM boundary. PCM (Pulse-Code Modulation) is the raw, uncompressed digital audio format that eventually gets sent to your speakers. It’s the terminal endpoint of every audio pipeline, regardless of how aggressively encrypted the source was.
回来后，他把养老服务这件事列为工作重点，多次开展专题调研。
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implies a_i=0 \quad \forall i. Recall that l_i(x) is 1