Hettangian Age

例句：

1. 1. The Hettangian Age is characterized by the development ofearly writing systems.
   赫特安尼安时代以早期书写系统的形成为特征。
2. 2.The discovery of the HettangianAge in Europe has revolutionized our understandingof human history.
   在欧洲发现赫特安尼安时代，已彻底改变了我们对人类历史的理解。
3. 3. The HettangianAge was a time of great cultural andtechnological advancements.
   赫特安尼安时代是文化和技术大发展的时期。