摘要
今天的火星看起来干燥、多尘又贫瘠。但这些年来,科学家发现了各种证据,证明火星曾经可能水源充足。Today,Mars looks dry,and dusty.But over the years,scientists have found all kinds of evidence that the planet was once full of water.They've found empty riverbeds,and signs of water erosion(侵蚀),and now,they're trying to figure out if this rock could have once had the right ingredients to host life.Because scientists announced the first geological evidence that Mars used to have a global system of underground,interconnected lakes.
