说明：  本播放器可实现播放、暂停、复位等功能。为了体现乐曲播放过程中的动态效果，增加了1只LED，作随机闪烁以指示旋律的节奏。
(This player can play, pause, reset function. In order to reflect the dynamic effect of a song during playback, an increase of an LED, random flashes to indicate the rhythm of the melody.)