white elephant
无用的负担或装饰品
口语·指昂贵而无用的东西
英文释义
an expensive or burdensome possession or project that is more trouble than it is worth
例句
That old mansion is a white elephant; it costs a fortune to maintain and nobody uses it.
典故来源
源自古代暹罗（今泰国）国王将白象赐予臣下的习俗，因白象被视为神圣但饲养昂贵，成为负担。