护城河

moat

noun Rare #31,938
moat Can also be used figuratively for something that protects or shields.
CH: 古城外面有一条护城河。
EN: There is a moat outside the old city.

再往外是护城河,宽六十英尺,深度不到六十英尺。

Beyond that was the moat, sixty feet wide and less than sixty feet deep.

“护城河的水本该流到这里来。”

The moat water was supposed to flow here.

如果你是城堡我就是你的护城河

If you are a castle, then I am your moat.

— 朱诺 (2007)