VOA慢速英语:The Diamond Lens by Fitz-James O'Brien, Part One

microscope – n. a device used to make very small things look larger so they can be studied

lens - n. a clear curved piece of glass or plastic that is used to make things look clearer, smaller, or bigger

magnify - v. to make (something) appear larger

ignorant -  adj. lacking knowledge or information

carat – n. a unit for measuring the weight of jewels (such as diamonds) that is equal to 200 milligrams​

enormous - adj. very great in size or amount