The midpart is regarded as a segment of the whole ring and is calculated by the method of stress analysis which is based on the theory of shell.
中间部位视为整体环的一部分，按壳体理论应力分析方法计算。
2
Qinghai is tectonically in the mid-western part of the Pan-Cathysian Block Group and the north part of eastern Tethys.
在构造上，青海位于泛凯西斯山脉群的中西部和特提斯东部的北部。
3
This is part of the system of mid-ocean ridges that form as the tectonic plates of the Earth's crust move apart-a process known as sea floor spreading.