protogalaxy / ˌproʊ toʊˈgæl ək si, ˈproʊ toʊˌgæl- /

📖毕业后词汇原子星系原子系原子星原动力

protogalaxy 的定义

n. 名词 noun

plural pro·to·gal·ax·ies.Astronomy.

  1. the large concentration of gas and dust from which a galaxy is formed.