VOA慢速英语:国际标准公斤实体Le Grand K即将退休 将用普朗克常数来取代

cylinder – n. a circular object

lock – n. device used to close a door that requires a key to open

unit – n. measure used to express an amount or quantity

constant – adj. happening a lot or all the time

vault – n. a special room where valuable objects are kept

innovation – n. new idea or method that is being tried for the first time, or the use of such ideas or methods

formula – n. a set of letters, numbers, or symbols used to express a mathematical or scientific rule

accuracy – n. how correct or exact something is

application – n. the way in which something can be used for a particular purpose

scalable – adj. able to grow or be made larger

absolutely – adj. completely, without question