北城以北的情薄少年南国以南的薄情菇凉
[bĕi chéng yĭ bĕi de qíng bó shăo nián nán guó yĭ nán de bó qíng gū liáng]
Describes a distant relationship between 'north of the northern city' and 'south of the southern country', portraying two people separated by distance, with the terms '薄' suggesting emotional distance or lack of deep feelings on both sides.