名词
中文翻译：地质时期
同义词：
['geographical period', "geologic period例句：1. The discovery of the first dinosaurs in the Late Cretaceous period changed our understanding of Earth's history.（在晚白垩纪时期首次发现恐龙改变了我们对地球历史的理解。）"]
例句：
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1. The discovery of the first dinosaurs in the Late Cretaceous period changed our understanding of Earth's history.
在晚白垩纪时期首次发现恐龙改变了我们对地球历史的理解。
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2. The study of geological periods helps us understand the evolution of life on Earth.
研究地质时期有助于我们理解地球上生命的演变过程。
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3. During the Mesozoic era, there were several major geological periods characterized by significant changesin climate and ecosystems.
在中生代，有几个主要的地质时期，这一时期气候和生态系统发生了显著变化。