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N-COUNT
（活動的）中心，核心
You can describe a place as a hub of an activity when it is a very important centre for that activity.
例句
The island's social hub is the Cafe Sport...
該島的社交中心是“體育咖啡館”。
As a hub of finance and communications, Paris is now almost equal to London.
作為一個金融和交通中心，巴黎現在幾乎可媲美倫敦。
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N-COUNT
（輪）轂
The hub of a wheel is the part at the centre.
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N-COUNT
航空樞紐;中心機場
A hub or a hub airport is a large airport from which you can travel to many other airports.
例句
...a campaign to secure Heathrow's place as Europe's main international hub.
旨在穩固希思羅機場作為歐洲主要航空樞紐地位的宣傳活動
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（網絡）集線器
A hub is a device for connecting computers in a network.