名词
中文翻译：下奥陶纪
同义词：
['lower ordovician', 'lower eucalyptian例句：1. The Lower Ordovician period is characterized by the appearance of the first dinosaurs.（下奥陶纪时期以恐龙的出现为特征。）2. The Lower Ordovician rocks are rich in minerals that can be used to make glass.（下奥陶纪的岩石富含可以用来制造玻璃的矿物。）']
例句：
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1. The Lower Ordovician period is characterized by the appearance of the first dinosaurs.
下奥陶纪时期以恐龙的出现为特征。
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2. The Lower Ordovician rocks are rich in minerals that can be used to make glass.
下奥陶纪的岩石富含可以用来制造玻璃的矿物。
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3.During the Lower Ordovician, the Earth's climate was drier and more continental.
在低奥陶纪，地球的气候更干燥、更大陆化。