A deep, wide ditch, usually filled with water, typically surrounding a fortified medieval town, fortress, or castle as a protection against assault.
A deep, wide ditch, usually filled with water, typically surrounding a fortified medieval town, fortress, or castle as a protection against assault.
护城河一条深而宽的、通常有水沟环绕设防的中世纪城镇城堡或堡垒，用以抵抗外来袭击