名词
中文翻译：第四纪
同义词：
['fourth century', 'tertiary period', 'tertiary age']
例句：
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1. The quaternary glaciers have been melting due to global warming.
由于全球变暖，第四纪冰川正在融化。
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2. The fossil record from the Quaternary period provides insights into Earth's past climate.
第四纪时期的化石记录提供了对地球过去气候的洞察。
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3. The Quaternary Period was a time of great environmental change and human settlement.
第四纪时期是环境巨变和人类定居的重要时期。