北城半夏蓝城半凉
[bĕi chéng bàn xià lán chéng bàn liáng]
Combining references to two different places and seasons, it loosely translates as 'The Northern City’s Summer, Blue City’s Half-Cold.' This might evoke nostalgia for certain times and memories in these distinct places ('北城' means Northern City; '半夏蓝城' plays on summer and blueness symbolizing coldness and tranquility).