黑白琴键弹奏不出的悲伤
        
            [hēi bái qín jiàn dàn zòu bù chū de bēi shāng]
        
        
            'Hei Bai Qin Jian Dan Zhou Bu Chu De Bei Shang,' means 'Sadness that even black and white piano keys cannot play.' This represents an ineffable sorrow, emphasizing a depth of sadness beyond words or music.