Hercynian geosyncline

例句：

1. 1. The Hercynian geosyncline is a geological feature that has been the subject of much scientific study.
   赫钦尼亚地堑是一个地质特征，一直是科学研究的焦点。
2. 2. The geosyncline plays a crucial role in the movement of tectonic plates and the formation of mountain ranges.
   地堑在构造板块的运动和山脉的形成中起着至关重要的作用。
3. 3. The Hercynian geosyncline is located in the northern part of the Alps, where it forms a deep valleybetween two mountain ranges.
   赫钦尼亚地堑位于阿尔卑斯山脉的北部，它形成了两个山脉之间的一个深谷。