1. It's difficult to decide the position of the unit in evolutional seriary of magma.
   该单元在岩浆演化序列中所处的位1难以确定。
2. The new framework, comprising a pre-trilobite series and three trilobite-dominated series, reflects the major evolutional stages of the life on Earth during Cambrian Period.
   新的划分方案包括1个“前三叶虫统”和3个“三叶虫优势统”，反映了寒武纪生命发展的主要阶段。

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