N-COUNT
(某种动物的)主要栖息地
If you say that a place is a stronghold of a particular type of animal, you mean that more of that type of animal live there than in other places.
例句
Shetland is the last stronghold of otters in the British Isles.
设得兰群岛是水獭在不列颠群岛上最后的栖息地。