外共生体：生活在另一种生物体外表的共生生物。
Ecto commensal: a commensal organism that lives on the outer body surface of another organism.
除常见的立方金刚石结构外，还存在一种罕见的六方金刚石结构。它们通常共存在一个金刚石织构体中，形成共生晶体。
They are made up from both of cubic and hexagonal diamond crystal structures, which are called a sort of intergrowth crystals.
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