They grow together in a colony called a coral head.

它们生长在一起形成珊瑚头。

So what we do is we'll take multiples of that small piece of core, put them close together on a dead coral head, they fuse.

所以我们要做的是，取几块生命力顽强的珊瑚，把它们紧密地放在一个死珊瑚头上，让它们融合在一起。