n.壕沟；护城河
v.将…围以壕沟
When the moat is deep a ladder can be used. 城壕深了架梯子；问题总有解决的办法。
A moat separates the animals in the zoo from the spectators. 一条深沟把动物园里的动物和观众隔开。
There is a moat round the castle. 城堡外环绕着一条护城河。
The medieval town was fortified with a high wall and a deep moat. 这座中世纪的城市周围建有城墙和护城河。
