VOA慢速英语:Mars: How Will Humans Get There?

geek – n. a person who is very interested in and knows a lot about a particular field or activity

simulator – n. a machine that is used to show what something looks or feels like and is usually sued to study something or to train people

cargo - n. supplies

outpost – n. a small military base or town far away from other towns

propellant - n. fuel

rookies - n. a person who has just started a job or activity, a beginner

colonize - v. to establish a place occupied by humans

probe – n. a thin, long instrument that is used especially for examining