Be careful not to confuse the words priceless, invaluable and worthless. Something which is priceless is so precious that it is difficult to give it a value. …priceless masterpieces by Canova and Bernini. Something which is invaluable is very useful indeed. It has a spelling checker, which is invaluable if you are dyslexic. In contrast, something that is worthless is of very little value. I'm afraid your shares are now worthless.

注意不要混淆 priceless，invaluable 和 worthless。priceless表示非常珍贵，因而难以计算其价值，如：priceless masterpieces by Canova and Bernini（卡诺瓦和贝尔尼尼的无价杰作）。invaluable 表示非常有用，如：It has a spelling checker, which is invaluable if you are dyslexic（它带有一个拼写检查程序，对有诵读困难的人非常有用）。相反，worthless 表示没有什么价值，如：I'm afraid your shares are now worthless（恐怕你的股票现在一文不值了）。