你是我的小心跳我是你的小心脏
[nĭ shì wŏ de xiăo xīn tiào wŏ shì nĭ de xiăo xīn zàng]
This translates to 'You are my heartbeat; I am your heart.' It indicates a profound connection between two hearts or love partners where both hearts belong exclusively to each other, reflecting strong emotions of intimacy or love between the users.