你是我全部的心情我是你全部的笑容
[nĭ shì wŏ quán bù de xīn qíng wŏ shì nĭ quán bù de xiào róng]
'You Are My Every Mood and I Am Your Whole Smile', this conveys a deep mutual emotional dependence, meaning two people are the entirety of each other’s happiness or life focus.