这个阶段星云的大小与其质量成反比。The size of the nebula at this stage is inversely proportional to its mass.对暗星云的研究被一种新发现所推进.The investigation of dark nebulas has been facilitated by a new discovery.形成行星状星云的这一图象可能会引起许多异议.Many objections...

“星云的”的英语可以翻译为：nebular，nebulous ...