N-COUNT
(持共同態度或信仰的人的)大本營,據點
If you say that a place or region is a stronghold of a particular attitude or belief, you mean that most people there share this attitude or belief.
例句
The westernmost part of north Wales is a stronghold of Welsh-speakers...
北威爾士最西部是說威爾士語人的聚居區。
The seat was a stronghold of the Labour party.
這個選區是工黨的大本營。