It is helping to transform military field fortifications worldwide. Times, Sunday Times (2006)Its defensive towers and fortifications were still under construction. Times, Sunday Times (2008)Gradually the generals began to reconsider their tactics and to experiment with field fortifications and other defensive measures. The American Nation: A History of the United States to 1877 (1995)
偶尔使用。在柯林斯辞典中， fortification 是3万个最常用词之一。
fortification 的定义—— 柯林斯 英语词典
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