focal region meaning in English

汇点区
聚焦区
震源区

As been analyzed , searching of mec is not carried out in the whole solution space with equal intensity , but in some focal regions . meanwhile , within each selected region , the search focus only on a narrow band . those features of mec explain clearly why it has excellent performance
分析认为mec不是对整个解空间进行相等强度的搜索，而是通过异化操作在整个解空间中选择寻找有希望存在最优解的吸引域，再对这些区域进行趋同(局部)搜索，而在趋同(局部)搜索中又只搜索了一个窄的带子，因此mec具有很高的搜索效率。
Combined with some previous results , we have generalized preliminarily the dynamic evolution characteristics of stress field in the focal region and its adjacent area before moderate and strong earthquakes , and tried to give out the judgement index of earthquake prediction with the comprehensive mechanism solution of small earthquake
结合前人的有关研究成果，综合归纳了中、强地震前震源区及附近应力场的动态演变特征，并尝试给出了小震综合机制解参数预报地震的判据指标。