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。

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

horsehead nebula,[天文]马头星云.短语