護城河的用法和樣例：
例句
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這座中世紀的城市周圍建有城牆和護城河。
The medieval town was fortified with a high wall and a deep moat. -
暗牆；隱籬用來作柵欄，但又不阻礙視線或景觀的護城河，或由牆圍住的溝或陷入地中的籬笆
A moat, walled ditch, or hedge sunk in the ground to serve as a fence without impairing the view or scenic appeal. -
城堡外環繞著一條護城河。
There is a moat round the castle.
