n.中心；輪轂；輪軸

Chicago is a hub of airline traffic. 芝加哥是航運中心。

The playground is the hub of parental supervision. 游樂場是家長監(jiān)督的中心。

Hong Kong is the regional hub for thousands of international companies. 香港是國際公司在亞太區(qū)的營商中心。

Two new spokes and a hub must be made. 我必須重新做兩根輪輻和一個輪轂。

One technician proposes installing a hub. 一個技術人員計劃安裝一個轂。

Spokes radiate from a wheel hub. 輪條從輪軸向四周伸出