The structure evolution process experienced 4 stages: intensively faulting period, the period transformed from fault depression to sag, depression period and compaction fold period.

该区的构造演化经历了强烈断陷期、断坳转换期、坳陷期和挤压褶皱期4个演化阶段。

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Using the viewpoint of geomechanics, the geological structure in Yangquan Mining Area is analyzed, and the structural system, the structure evolution and its formation mechanism are discussed.

运用地质力学的观点分析阳泉矿区地质构造，探讨构造体系、构造演化及其形成机制。

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The structure evolution of AZ91D magnesium alloy and the modified AZ91D magnesium alloy during semi solid isothermal heat treatment was studied, and its transformation mechanism was also discussed.

研究了未变质处理和变质处理的AZ 91d镁合金在半固态等温热处理过程中的组织演变，并对其组织演变机理进行了探讨。

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"By looking at and understanding the properties of El Gordo, we're able to understand the time evolution of the structure formation of the Universe, " Prof Hughes told BBC News.

BBC: 'El Gordo' is largest distant galaxy cluster ever seen

This information is expected to unlock new information about the structure, origin and evolution of our Galaxy.

BBC: A billion pixels for a billion stars

Investigating the evolution of the lion social structure in such detail, Prof Packer and his team have had to look closely at the many theories for this lifestyle that have been suggested over the years, such as co-operative hunting, communal suckling of cubs and defence of young against attack.

BBC: Lions breed better if living near joining rivers