宝山空回（寶山空回）　

◎ 宝山空回 bǎoshān-kōnghuí

[stay in treasure mountain but get nothing] 宝山:佛家指佛法,泛指积聚珍宝的山。虽然到了满是宝藏之地,却空无所获而回。原比喻受过佛法,却没有收获。也比喻置身学府却一无所得