Ordovician period
奥陶纪时期
Ordovician fossils
奥陶纪化石
Ancient Ordovician seas
古代奥陶纪海洋
Ordovician extinction event
奥陶纪灭绝事件
The Ordovician period was a time of great diversification of marine life.
奥陶纪时期是海洋生物多样化的时期。
Many trilobites lived during the Ordovician period.
许多三叶虫生活在奥陶纪时期。
The Ordovician period lasted from about 485 to 444 million years ago.
奥陶纪时期持续约4.85亿到4.44亿年前。
Fossils from the Ordovician period provide valuable information about ancient ecosystems.
奥陶纪时期的化石提供了有关古代生态系统的宝贵信息。
The Ordovician period followed the Cambrian period.
奥陶纪时期紧随寒武纪时期。
Some of the earliest fish evolved during the Ordovician period.
一些最早的鱼类在奥陶纪时期进化。
The climate during the Ordovician period was warmer than today.
奥陶纪时期的气候比今天暖和。
The Ordovician period is named after a Celtic tribe called the Ordovices.
奥陶纪时期以一个名为奥尔多维克斯的凯尔特部落命名。
The Ordovician period ended with a mass extinction event.
奥陶纪时期以一次大规模灭绝事件结束。
Scientists study the rock layers from the Ordovician period to learn about Earth's history.
科学家研究奥陶纪时期的岩层以了解地球的历史。
Ordovician period
奥陶纪时期
Ordovician fossils
奥陶纪化石
Ancient Ordovician seas
古代奥陶纪海洋
Ordovician extinction event
奥陶纪灭绝事件
The Ordovician period was a time of great diversification of marine life.
奥陶纪时期是海洋生物多样化的时期。
Many trilobites lived during the Ordovician period.
许多三叶虫生活在奥陶纪时期。
The Ordovician period lasted from about 485 to 444 million years ago.
奥陶纪时期持续约4.85亿到4.44亿年前。
Fossils from the Ordovician period provide valuable information about ancient ecosystems.
奥陶纪时期的化石提供了有关古代生态系统的宝贵信息。
The Ordovician period followed the Cambrian period.
奥陶纪时期紧随寒武纪时期。
Some of the earliest fish evolved during the Ordovician period.
一些最早的鱼类在奥陶纪时期进化。
The climate during the Ordovician period was warmer than today.
奥陶纪时期的气候比今天暖和。
The Ordovician period is named after a Celtic tribe called the Ordovices.
奥陶纪时期以一个名为奥尔多维克斯的凯尔特部落命名。
The Ordovician period ended with a mass extinction event.
奥陶纪时期以一次大规模灭绝事件结束。
Scientists study the rock layers from the Ordovician period to learn about Earth's history.
科学家研究奥陶纪时期的岩层以了解地球的历史。
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