VOA慢速英语:A Watery Flight to the Moon(翻译)

quest – n. a long, difficult effort to find or do something

challenge - n. a difficult problem; something that is hard to do

deliver – v. to take something to a person or place

beyond – adj. on or to the farther side of something

spark - n. a small particle of a burning substance

stage – n. a piece or part of something