When the clip is playing, he can wave a palm at the screen to call up the controls to rewind the video or turn up the volume.
当视频播放时，他可以对着屏幕挥动手掌激活控制菜单，倒回视频或者调高音量。
When the clip is playing, he can wave a palm at the screen to call up the controls to rewind the video or turn up the volume.
当视频播放时，他可以对着屏幕挥动手掌激活控制菜单，倒回视频或者调高音量。
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