The sudden appearance of abundant and varied fossils makes a worldwide time line for dividing the geological time scale into two main parts.
丰富多样的化石的突然出现为在世界范围内把地质年代划分为两大主要部份提供了时间界限。
The sudden appearance of abundant and varied fossils makes a worldwide time line for dividing the geological time scale into two main parts.
丰富多样的化石的突然出现为在世界范围内把地质年代划分为两大主要部份提供了时间界限。
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