Molecular clouds play an integral role in the prestellar evolutionary sequence of interstellar matter.

分子云在星际物质的星前期演化序列中起着不可缺少的作用.

辞典例句

We observe in the galaxy much larger, denser, and more massive aggregates of cold interstellar matter.

在银河系中还观测到大小, 密度和质量都要大得多的冷星际物质团.

辞典例句