"(2) Provide a developer who has requested a signal with respect to a particular user with a digital signal via a reasonably consistent real-time application programming interface that identifies, at a minimum, which of the following categories pertains to the user."
Pulse-Code Modulation (PCM) — MDN Web Docs
，这一点在Line官方版本下载中也有详细论述
Силовые структуры
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