“用壁垒围绕”可以翻译为“surround with barriers” 或者 “enclose with barriers” 。
例如:
The ancient city was surrounded with barriers to protect it from invaders.(这座古城用壁垒围绕,以抵御入侵者。)
They decided to enclose the important area with barriers for security reasons.(出于安全考虑,他们决定用壁垒围绕这个重要区域 。)