n.a strongly fortified defensive structure

同義詞：fastness

Nature's Strongholds:The World's Great Wildlife Reserves
Strongholds and Battlegrounds: Measuring Party Support Stability in Canada
Fortifications and Military Tactics: Fulk Nerra's Strongholds circa 1000
Coastal dunes as important strongholds for the survival of the rare Niobe fritillary ( Argynnis niobe )
In the shadow of the city: Africa's urban poor in opposition strongholds
Conservation management within strongholds in the face of disease-mediated invasions: red and grey squirrels as a case study.
Virtual world and biometrics as strongholds for the development of innovative port interoperable simulators for supporting both trai...
Virtual world and biometrics as strongholds for the development of innovative port interoperable simulators for supporting both trai...
Singen copper, alpine settlement and early bronze age mining : is there a need for elites and strongholds?
Density, abundance and activity patterns of the endangered Tapirus bairdii in one of its last strongholds in southern Mexico Introdu...