moats
n.
（古时城堡为了防御而在四周挖的）壕沟，护城河( moat的名词复数 );
（现代动物园为防止动物逃跑而在场地四周挖的）深沟;
例句:
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There are no moats around our cities that keep the problems in.
在我们的城市周围并没有护城河将这些问题封锁在城内.
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Nowadays , the watery moats which were Venice's protection have become its enemy.
曾经保护威尼斯的护城河现今却成了它的大敌.
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What did you expect, coffins and dungeons and moats?
你以为呢棺材地牢还有壕沟?
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He then drew rings around them, which he said were the moats.
来自NEWYORKER
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The famed investor has said that he seeks economic castles protected by unbreachable 'moats.
来自WSJ
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Morningstar describes five ways moats develop.
来自WSJ