名词
中文翻译：下寒武纪
同义词：
['lower cretaceous']
例句：
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1.The Lower Cambrian period is characterized by the appearance of the first vertebrates.
下寒武纪时期以首次出现脊椎动物为特征。
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2.The Lower Cambrian fossils are significant for understanding the early evolution of life.
下寒武纪化石对于理解生命早期进化具有重要意义。
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3. The Lower Cambrian was a time of great diversity and complexity in marine ecosystems.
下寒武纪是海洋生态系统多样性和复杂性达到高峰的时期。