n.中心；轮毂；轮轴
Chicago is a hub of airline traffic. 芝加哥是航运中心。
The playground is the hub of parental supervision. 游乐场是家长监督的中心。
Hong Kong is the regional hub for thousands of international companies. 香港是国际公司在亚太区的营商中心。
Two new spokes and a hub must be made. 我必须重新做两根轮辐和一个轮毂。
One technician proposes installing a hub. 一个技术人员计划安装一个毂。
