... fortresses解释：堡垒，要塞( fortress的名词复数 ) fortresses例句： They will establish impregnable fortresses. 他们将建造坚不可摧的城堡。 ...
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Two Fortresses 双城记
Master of Fortresses 要塞大师 ; 碉堡防御大师
Parthian Fortresses of Nisa 尼莎帕提亚要塞
military fortresses 军事堡寨
software fortresses 软件堡垒
Simply speaking, fortress defence is to fight with fortress as base.
简单说来,城池防御就是以城池为依托进行作战。
参考来源 - 宋代城池防御探究·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT A fortress is a castle or other large strong building, or a well-protected place, which is intended to be difficult for enemies to enter. 城堡; 大堡垒; 要塞
...a 13th-century fortress.
…一座13世纪的城堡。
Within days, the Gothamite occupation has built a series of sea fortresses.
几天之内，占领地盘的哥特人就建立了一系列的海上堡垒。
Constructing nuclear fortresses was not an easy task.
建造防核堡垒并不是一件容易的事。
They would patrol the collapsing cities, usually in motorcades, and then return to their fortresses.
他们以车队巡逻废墟中的城市，然后回到堡垒。
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