opisthocline annular shelf

例句：

1. 1. The geological formation of the area is characterized by an opisthocline, which is a type of rock structure where the strata dip in opposite directions.
   该地区的地质构造特征为背斜，这是一种岩石结构类型，其中地层呈相反方向倾斜。
2. 2. In the study of tectonics, understanding the characteristics of opisthoclines is crucial for predicting the movementof tectonic plates.
   在地质学研究中，了解背斜的特征对于预测板块运动至关重要。
3. 3. The discovery of this new opisthocline has led to further research on the geological history of the region.
   新发现的背斜区域引发了对该地区地质历史的进一步研究。