N-COUNT [usually singular]（发生）地点；核心；中心 The locus of something is the place where it happens or the most important area or point with which it is associated. （发生）地点；核心；中心 [formal]
Barcelona is the locus of Spanish industry. [+ of]
巴塞罗那是西班牙工业中心。
Thereafter, the military remained the locus of real power.