名词
中文翻译：白垩纪
同义词：
['Pleistocene', 'Pleistocene epoch']
例句：
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1.The Pliocene era is characterized by the appearance of mammals like mammoths and saber-toothed cats.
白垩纪时期以哺乳动物如猛犸象和剑齿虎的出现为特征。
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2. The Pliocene period saw significant changes in the Earth's climate, leading to the development of new ecosystems.
白垩纪时期，地球气候发生了显著变化，导致了新生态系统的发展。
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3. The Pliocene epoch is often used as a reference point for understanding the Earth's geological history.
白垩纪时期常被用作了解地球地质历史的一个参考点。