他的心口有个洞她的心口多块肉
[tā de xīn kŏu yŏu gè dòng tā de xīn kŏu duō kuài ròu]
Refers to differing emotional capacities where one person feels lacking ('hole in heart') while another may feel abundantly sensitive ('extra piece of flesh in heart'). Reflects on the nature of empathy and emotion in interpersonal relationships.