Since Hercynian Era there have been obvious differences in vertical and horizontal basin pattern of Linqing depression, a strong superpositionstructure of post basin being on the earlier basins.
The landscape field focuses on the deep structure of landscape, in which the form of architecture comes from the superposition of multi-layer control line systems.
景观的场域性关注于整体景观的深层结构，其中建筑的形态来自于多重控制系统的复合叠加。
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Problems existing in the reliability of two-PC governor are pointed out, and a new structure of high-reliability PC governor of functional superposition is proposed.