rampart

n.

（城堡等周围宽阔的）防御土墙；防御，保护；

复数：ramparts

1. They had been the great rampart of the colony on the North.
   他们一向是北部殖民地的坚强保垒。
2. The rampart was destroyed totally.
   壁垒被彻底摧毁了。
3. Perhaps the tower is part of the rampart of the city.
   这城楼或许就是城墙的一部分。

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