Pleiocene

例句：

1. 1. The Pleistocene era is characterized by the development of agriculture and the rise of human civilization.
   冰河时代以农业的发展和人类文明的兴起为特征。
2. 2. The Pleistocene epoch was a time of great change in the Earth's climate and geography.
   冰河时代是一个地球气候和地理发生巨大变化的时期。
3. 3.The Pleistocene epoch is often referred to as the "Dark Ages" because of its lack of technological advancements.
   冰河时代通常被称为“黑暗时代”，因为这一时期缺乏技术进步。