The defences of the city are strong.
这个城市的防
工事很稳固。
The defences of the city are strong.
这个城市的防工事很稳固。
The fortifications were out of repair.
防工事年久失修。
The regiment secured its position while awaiting the enemy attack.
等待敌人进攻之时, 加强了防工事。
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