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.它們是獨一無二、不可替代的無價之寶。...the priceless treasures of the Royal Collection.英國王室收藏的無價珍寶
ADJ-GRADED
寶貴的；極其有用的
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...它們是對英國歷史上一個短暫時期的極為珍貴的記錄。The influence of someone like David York will be priceless.像大衛·約克這樣的人能帶來非常積極的影響。