名词
中文翻译：北海时代
同义词：
['Cretaceous Age', 'Cretaceous Era']
例句：
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1. The Baishan Age is a time of great geological activity in China.
白垩纪是在中国发生的一次重大地质活动时期。
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2. The discovery of the Baishan Age fossils has helped to redefine our understanding of Earth's history.
白垩纪化石的发现有助于重新定义我们对地球历史的理解。
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3. The Baishan Age was characterized by the rise of dinosaurs and the extinction of many species.
白垩纪以恐龙的崛起和许多物种的灭绝为特征。