你知道我对你的好我知道你对我的好
[nĭ zhī dào wŏ duì nĭ de hăo wŏ zhī dào nĭ duì wŏ de hăo]
'Ni Zhi Dao Wo Duì Ni De Hao Wo Zhi Dao Ni Dui Wo De Hao', which stands for 'You know how good I am to you, and I know how good you are to me.' This indicates mutual understanding between two people and their shared efforts within any relationship - whether romantic or platonic.