单词学习：nebula 天文学/医学
nebula
/ˈnebjələ/
星云；角膜翳
Professor Gu explained that a nebula is a vast cloud of gas and dust in space, often serving as a stellar nursery.
顾老师解释说，星云是太空中由气体和尘埃组成的巨大云团，通常是恒星的诞生地。
单词卡片
卡片已就绪
