1 . 防御工事
an impregnable fortress ; fortificationsthat made the frontier inviolable ., 一个坚固的城堡 ; 防御工事使得边境不可侵犯.
2 . 工事
We directed all our guns against the enemy fortifications., 我们把炮口都对准了敌人的工事.
3 . 堡垒上
His photo , stapled to sandbag fortifications, flutters in the breeze ., 他的照片被钉在沙袋堆成的堡垒上 , 在微风中飘动.
4 . 食品委员会有限公司
first of all , we should quickly check up on our fortifications.香港食品委员会有限公司.