慢速英语:美国宇航局收集到的数据表明土卫六类似地球可能存在生命

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plain – n. large area of flat land

diverse – adj. including many different types

marshal – v. bring together

evolve – v. develop over time

crust – n. hard, dry layer on the surface of something

mission – n. a task or job that someone is given to do