- A military fortification constructed of sturdy material, such as concrete, and designed with ports for defensive firing or observation.碉堡：用混凝土等坚固的物质构筑起的军事防御工事，而且设有用于防御时射击或观察的孔口
- A heavily reinforced building used for launch operations of missiles and space launch vehicles.火箭发射防护室：用于发射导弹和太空飞行器的牢固建筑物
- A fort made of squared timbers with a projecting upper story.木堡：用方木做成的带有突出尖顶的堡垒