• play
  • pause
  • stop
  • mute
  • unmute
  • max volume
  • repeat
  • repeat off
  • 正在播放：世界真奇妙：世界上第一台显微镜【睡前百科】_演播：晚安妈妈
Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.