我爱你是你不知道的秘密我想你是你猜不到的秘密
[wŏ ài nĭ shì nĭ bù zhī dào de mì mì wŏ xiăng nĭ shì nĭ cāi bù dào de mì mì]
It roughly translates to 'Loving you is a secret you don't know. Missing you is a secret you can never guess.' The statement reveals deep-hidden feelings of loving and missing someone so strongly that even the loved one can never imagine.