VOA慢速英语:美国国家航空航天局展示木星的构成

jet stream – n. a strong current of fast winds high above the Earth's surface

solar system - n. our sun and the planets that move around it

giant – n. a thing that is very large, powerful,

ionize – v. to make an atom or group of atoms that has a positive or negative electric charge from losing or gaining one or more electrons

symmetry – n. the quality of something that has two sides or halves that are the same or very close in size, shape, and position

hemisphere – n. half of the Earth

equator – n. an imaginary circle around the middle of the Earth