hub

Từ điển Oxford Advanced Learner 8th

hub [hub hubs] BrE [hʌb] NAmE [hʌb] noun
1. usually singular ~ (of sth) the central and most important part of a particular place or activity
•the commercial hub of the city
•The kitchen was the hub of family life.
•to be at the hub of things (= where things happen and important decisions are made)
•a hub airport (= a large important one where people often change from one plane to another)
2. the central part of a wheel

Word Origin:
early 16th cent. (denoting a shelf at the side of a fireplace used for heating pans): of unknown origin (compare with ↑hob).

Example Bank:
•a hub airport
•the commercial heart/hub of the city