One very convenient thing about working with coral is that they are colonial organisms.

研究珊瑚最方便的一点就是珊瑚是群体生物。

But these could be the fossils of colonial unicellular organisms, bacterial mats, or something else entirely.

但这些可能是殖民地单细胞生物、细菌垫或其他完全不同的东西的化石。