the most important place where a particular activity takes place （活动的）中心
a telecommunications hub and business centre 电信枢纽与商业中心
Bombay is the financial hub of India. 孟买是印度的金融中心。
2
the part at the centre of a wheel （轮）毂
3
a central airport that passengers can fly to from smaller local airports in order to make international or long-distance flights （可乘搭国际航班或长途航班的）大机场，枢纽机场