闭过程 meaning in English

closed procedure

More specially , physical concepts are required to understand folds , faults , and diapirs , and hence their roles in petroleum entrapment
更为特别的是，在理解褶皱、断层和底辟以及它们在石油圈闭过程中的作用时需要物理概念。
Based on state space method of modern control theory , the mathematical model for the two way / two position hydraulic operated directional valve in thread cartridge is established
摘要基于现代控制理论的状态空间法，建立了螺纹插装式液控换向阀开、闭过程的动态特性数学模型。