VOA慢速英语:An Underground World: Carlsbad Caverns National Park

attraction - n. something interesting or enjoyable that people want to visit, see, or do​

incredible - adj. extremely good, great, or large

inspiring - adj. causing people to want to do or create something or to lead better lives

elevator - n. a machine used for carrying people and things to different levels

chamber - n. a small space inside something

swarm - v. to move in a large group

prairie - n. a large, mostly flat area of land in North America that has few trees and is covered in grasses

whirlwind - n. a very strong wind that moves in a spinning or swirling motion and that can damage buildings, trees, etc.

range - n. open land that farm animals (such as cows and sheep) use for feeding and roaming