英语翻译

题目

英语翻译
The boundary of the city is distinctly marked by a high earthen rampart with a brick wall at the top running along a circuit of 3 1/ 4miles and pierced by several gates disappeared by high bastions.

答案

这个城市的界限是如此的分明.长达31/4英里的护城环道将高高的土墙砖顶的城堡紧紧围绕.几道大门托住城堡矗立在蓝天下,而高高的堡垒又使它忽隐忽现.
翻译的不好,请指教.