Llanvirnian Stage

例句：

1. 1. The Llanvirnian Stage is a period of geological history that occurred during the Carboniferous period.
   兰维恩阶段是地质历史上的一个时期，发生在石炭纪期间。
2. 2. The discovery of the Llanvirnian Stage has revolutionized our understanding of the Earth's past.
   发现兰维恩阶段已经彻底改变了我们对地球过去的理解。
3. 3.The Llanvirnian Stage is characterized by the presence of coal deposits and the development of marine life.
   兰维恩阶段以煤层的存在和海洋生物的发展为特征。