a central airport, station, etc. that operates many services 中央机场、车站等，提供多种服务 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. 这是该市公共汽车和铁路的主要交通枢纽。 Major hub airports have grown up all over the world. 全球各大枢纽机场纷纷崛起。
- [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).