0:00/0:12
倍速
  • x2
  • x1
  • x0.5
举报

Mechanical metronome produces an audible beat at regular intervals that the user can set in beats per minute. White metronome on dark background using vignetting.

视  频 ID：  22460338
版      权：  VideoNova Production
视频长度：  0:12
横纵比率：  1.90:1
所属分类：  教育 
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