adj.季，第四纪的，四进制的；四元的；四价的
n.四，四个一组

原形：quaternary复数：quaternaries

The geological time scale is divided into four eras: Paleozoic, Mesozoic, Cenozoic, and Quaternary.
地质时间尺度被分为四个时期：古生代、中生代、新生代和第四纪。
During the Quaternary period, glaciers expanded and retreated several times, shaping many landscapes we see today.
在第四纪期间，冰川多次扩张和退缩，塑造了我们今天看到的许多地貌。
Fossil records indicate that mammals thrived in the Quaternary period, with humans being the latest arrivals.
化石记录显示，哺乳动物在第四纪时期繁盛，人类是最晚出现的物种。
Quaternary deposits are rich in fossils, providing valuable insights into past climate conditions.
第四纪沉积物富含化石，为了解过去的气候条件提供了宝贵信息。
Quaternary science combines geology, climatology, and biology to study the Earth's recent history.
第四纪科学结合地质学、气候学和生物学来研究地球的近期历史。
The Quaternary period witnessed the rise and fall of various civilizations, including the Roman Empire.
第四纪见证了包括罗马帝国在内的多个文明的兴衰。
Archaeologists have found evidence of human habitation in the Quaternary, particularly in regions with favorable climates.
人类学家在第四纪发现了很多居住证据，特别是在气候适宜的地区。
The Quaternary Period is characterized by glacial cycles, which influenced the distribution of plant and animal species.
第四纪以冰河周期为特征，这对动植物种群分布产生了影响。
Quaternary deposits often contain layers of silt and gravel, deposited by melting glaciers.
第四纪沉积物通常包含由融化的冰川沉积的沙粒和砾石层。
Geologists use radiometric dating techniques to determine the age of rocks from the Quaternary era.
地质学家利用放射性同位素测年法来确定第四纪岩石的年龄。