VOA慢速英语:美国宇航局测试载人火星任务动力系统

mission –n. a task or a job given to a person or group

solar system –n. all the planets and other objects that orbit the sun

source –n. the provider of something that is needed or wanted

engulf –v. to flow over and cover

kilowatts –n. a measure of electrical power

reactor –n. a device (usually a large device) that produces energy from a nuclear reaction

core –n. the central part

paper towels –n. sheets of paper that are used for cleaning which usually come in rolls

recharge –v. to replace lost electrical power