ˇzhǐㄎㄜˇˋㄏㄨㄟˋhuìㄅㄨˋㄎㄜˇㄧㄢˊyánㄔㄨㄢˊchuán

  1. 只能用心領會無法言語表達撰稿訣竅只可意會,不可言傳自己用心琢磨。」

can be understood, but not described (idiom, from Zhuangzi 莊子)​; mysterious and subtle