drift epoch

例句：

1. 1. The drift epoch is a period of time during which the Earth's orbit changes.
   漂移时代是地球轨道发生变化的时期。
2. 2. The drift epoch marked the beginning of human civilization.
   漂移时代标志着人类文明的开始。
3. 3. The drift epoch was characterized by significant technological advancements.
   漂移时代以重大技术革新为特征。