砖块需要用砂浆固定。
The bricks need to be secured with ___mortar.
叛军连续数小时用迫击炮轰击了边境哨所。
The rebels ___mortared the border outpost for several hours.
士兵们用迫击炮向山上的敌人阵地开火。
The soldiers fired their ___mortars at the enemy positions on the hill.
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