If you say that something is priceless, you are emphasizing that it is worth a very large amount of money.
例句
They are priceless, unique and irreplaceable.它们是独一无二、不可替代的无价之宝。...the priceless treasures of the Royal Collection.英国王室收藏的无价珍宝
ADJ-GRADED
宝贵的;极其有用的
If you say that something is priceless, you approve of it because it is extremely useful.
例句
They are a priceless record of a brief period in British history...它们是对英国历史上一个短暂时期的极为珍贵的记录。The influence of someone like David York will be priceless.像大卫·约克这样的人能带来非常积极的影响。