sob story ---------- 悲伤的故事（非正式））

英文释义
(INFORMAL) A sentimental story intended to make everyone feel pity or sadness. (NOTE: "to sob" means "to cry")

例句
My mom's favorite old movie is a sob story about two people who love each other but can never get married.
我妈妈最喜欢的老电影是一个悲伤的故事：两个人彼此相爱，却永远不能结婚。