生活就像钢琴般，需要代表快乐的白键，和代表伤心的黑键一起拼凑，才会有美妙歌曲。
Happiness and sadness in life just like the black and white key on the piano.
Without any of them, our life will be incomplete.
Happiness and sadness in life just like the black and white key on the piano.
Without any of them, our life will be incomplete.
