海是一座没有墙的城岛是一颗没有潮的心
[hăi shì yī zuò méi yŏu qiáng de chéng dăo shì yī kē méi yŏu cháo de xīn]
A poetic expression that likens the sea to a city without walls and islands to hearts devoid of emotions or desires. It symbolizes a sense of freedom and tranquility, yet with a touch of loneliness.