名词
中文翻译：下志留纪
同义词：
['lower silurian', 'lower silurian', 'lower silurian period']
例句：
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1.The Lower Silurian rocks are a rich source of minerals.
下志留纪的岩石是丰富的矿物来源。
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2.The Lower Silurian period was characterized by the appearance of new species.
下志留纪时期以新物种的出现而著称。
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3.The Lower Silurian fossils provide valuable insights into the early life on Earth.
下志留纪化石为了解地球早期生命提供了宝贵的信息。