绿色列套用磁碟区控制项在其目前的层级之后，表示实际在的音乐的音量。
The green bar represents the actual volume of the music after applying the volume control at its current level.
当您看到灰色的列移动，告诉您，也，内容正在播放但绿色的列是难以可见的因为您的磁碟区设定低最后的结果是一个微语。
When you see the gray bar moving, that tells you that, well, something is playing, but the green bar is barely visible because your volume is set so low that the final result is a whisper.
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