慢速英语:天文学家绘制了新的银河系地图

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three-dimensional - adj. having or seeming to have length, width, and depth

twisted - adj. to bent or turned; changing its shape

spiral - n. a circular curving line that goes around a central point while getting closer to or farther away from it

galaxy - n. any one of the very large groups of stars that make up the universe

disk - n. a flat, thin, round object