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柯林斯的解释：The mayor of a town or city is the person who has been elected to represent it for a fixed period of time or, in some places, to run its government.
维基的解释：A mayor (from the Latin māior, meaning "greater") is the modern title of the highest ranking municipal officer.
就是为了好听：The Hon. Andrew Barlow thought the whole thing was a little ridiculous in Australia because ‘a city was a purely ecclesiastical thing: it was the seat of a bishop.There was an advantage simply in the grander title.’
In Britain, a municipality is a city or town which is governed by its own locally-appointed officials. You can also refer to a city's or town's local government as a municipality.