护城河的用法和样例：
例句
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这座中世纪的城市周围建有城墙和护城河。
The medieval town was fortified with a high wall and a deep moat. -
暗墙；隐篱用来作栅栏，但又不阻碍视线或景观的护城河，或由墙围住的沟或陷入地中的篱笆
A moat, walled ditch, or hedge sunk in the ground to serve as a fence without impairing the view or scenic appeal. -
城堡外环绕着一条护城河。
There is a moat round the castle.
