1. The size of the nebula at this stage is inversely proportional to its mass. 这个阶段的星云大小与其质量成反比。
2. As the nebula collapsed caused by its gravity, it spun faster and flattened into a disk. 当星云因其重力而坍缩时，它旋转得更快，并压扁成一个盘状。
3. During his sophomore year, he sold his first science-fiction story to a Scottish magazine named Nebula. 在他大二的时候，他把自己的第一个科幻故事卖给了一家名为《星云》的苏格兰杂志。
4. The same minerals that occur in refractory inclusions are believed to be the earliest-formed substances to have condensed out of the solar nebula. 难熔的内含物中的那种矿物质，也被认为是最早形成的太阳星云凝结的物质。
5. It seems very unlikely that large portions of the nebula were heated to such extreme temperatures, and huge nebula areas could not possibly have lost heat so fast. 星云的大部分都被加热到如此极端的温度似乎是不太可能的，而巨大的星云区域不可能这么快就失去热量。
