Some shell can be used to hold water有的甲壳可以用来装水。
After the fire,all that was left was the burned-out shell of the building.大火以后所剩下的就是被烧焦的建筑物的外壳了。
A shell exploded right beside his office.一颗炮弹就在他的办公室旁边爆炸了。