孤城片海曾与他左眸相似猫巷时光曾与她右手相扣
[gū chéng piàn hăi céng yŭ tā zuŏ móu xiāng sì māo xiàng shí guāng céng yŭ tā yòu shŏu xiāng kòu]
In Chinese poetic terms, it describes memories: once wandering with him (his left eye reminding me of cat alleyways) and holding hands with her (her right hand). It's a nostalgic reference to beautiful past times.