a central airport, station, etc. that operates many services （某地或活动的）中心，核心 The airport has become an international hub. 该机场已成为国际枢纽。 It's the city's major transportation hub for bus and rail. 它是该市主要的公交和铁路运输枢纽。 Major hub airports have grown up all over the world. 大型枢纽机场在世界范围内都有发展。
- [usually singular] hub (of something)
the central and most important part of a particular place or activity （某地或活动的）中心，核心 the commercial hub of the city 城市的商业中心 The kitchen was the hub of family life. 厨房是家庭生活的中心。 to be at the hub of things (= where things happen and important decisions are made) 在核心部门
the central part of a wheel 轮毂 
Word Originearly 16th cent. (denoting a shelf at the side of a fireplace used for heating pans): of unknown origin (compare with hob).