我在你的左心房你在我的右心室
[wŏ zài nĭ de zuŏ xīn fáng nĭ zài wŏ de yòu xīn shì]
Means literally 'I am in your left atrium, and you are in my right ventricle.', which romanticizes the interconnection between two hearts symbolically, highlighting closeness and dependency in relationships.