a defensive wall or other reinforcement built to strengthen a place against attack
防御工事;防御城墙。
[mass noun]the action of fortifying or process of being fortified
筑城,筑垒;设防
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the fortification of the frontiers. 边境设防。
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fortificationn.防御工事;防御城墙;设防;筑城;筑垒
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notificationn.通知;通告;告示
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certificationn.证明;证书;鉴定;检定
"late Middle English: via French from late Latin