名詞 hub:

1. the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes
2. a center of activity or interest or commerce or transportation; a focal point around which events revolve

1. The capital and largest city of Malaysia, on the southwest Malay Peninsula northwest of Singapore. Founded by tin miners in1857, it is the commercial and industrial hub of the country. Population, 937,817.
   吉隆坡馬來西亞的首都和最大城市，位于馬來半島的西南部、新加坡西北。于1857年由錫礦工人建立，現(xiàn)為該國的商業(yè)和工業(yè)中心。人口937, 817
2. A slot for a key in the hub or shaft of a wheel.
   鍵槽輪子的轂或軸里的鍵的溝槽

hub

n.（名詞）
The center part of a wheel, fan, or propeller.
輪軸：輪子、風(fēng)扇或推進(jìn)器之中心部分
A center of activity or interest; a focal point.See Synonyms at center
中心；焦點(diǎn)：活動(dòng)或興趣之中心；焦點(diǎn)參見 center

來源：
Probably alteration of hob
可能為 hob的變化