Hadean

例句：

1. 1. The Hadean civilization is one of the oldest in the world.
   海达恩文明是世界上最古老的之一。
2. 2. The Hadean epoch is characterized by extreme cold and darkness.
   海达恩时期以极端寒冷和黑暗为特征。
3. 3. The Hadean period was a time of great scientific discovery.
   海达恩时期是科学发现的伟大时期。