VOA慢速英语:美国宇航局在火星上发现与生命有关的“有机”物质

rover – n. a small vehicle that can move over rough ground, often used on the surface of other planets

organic – adj. of, relating to, or created from living organisms

meteorite – n. piece of rock from outer space

due diligence – n. the detailed examination of something

graduate – v. earn a degree or diploma from a school, college, or university

perpetuity – n. forever