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，详情可参考搜狗输入法下载
The script grabs the captured audio element, mutes it, sets playbackRate to 16 (the browser maximum), seeks to the beginning, and calls .play(). The browser, in its infinite eagerness to keep the buffer full ahead of the playback position, frantically fetches, decrypts, and feeds chunks into the SourceBuffer. Every single one of those chunks passes through the hooked appendBuffer and gets collected.，更多细节参见同城约会
Зарина Дзагоева。同城约会对此有专业解读