fortress

n.

堡垒，要塞；

vt.

设置要塞；用要塞防守；

复数：fortresses

1. Our soldiers laid siege to the enemy fortress.
   我们的战士包围了敌人的堡垒。
2. Complete thawing of the Fortress HUD.
   完成了堡垒界面中的融合。
3. They yielded the fortress to the enemy.
   他们把要塞让给了敌人。

The Fortress Language Specification
Fortress America: Gated Communities in the United States
The empty fortress: infantile autism and the birth of the self.
The empty fortress: infantile autism and the birth of the self.
Fortress Conservation. The Preservation of the Mkomazi Game Reserve, Tanzania
The Great Wall and the Empty Fortress: China's Search for Security
Fortress UK? Gated communities, the spatial revolt of the elites and time–space trajectories of segregation
Immigration and European Integration: Towards Fortress Europe? by Andrew Geddes
Immigration and European Integration: Towards Fortress Europe? by Andrew Geddes
Behind the Gates: Life, Security, and the Pursuit of Happiness in Fortress America