nebula相关例句和用法
As the nebula collapsed because of its gravity, it spun faster and flattened into a disk..随着由于重力引起的星云坍缩，它旋转得越来越快，并变成了盘状。
nebula英英释义星云英释中释na mass of gas and dust among the stars, which often appears as a bright cloud in the sky at night
nebula短语horsehead nebula,[天文]马头星云.短语
