n.仇敌;敌军;危害物;
例句:
Fascists is the most ruthless enemy of the people.
法西斯是人民最残酷无情的敌人.
The enemy attacked us at night.
敌人在夜间袭击了我们.
They fired ( their guns ) at [ on, upon ] the enemy.
他们向敌人 开炮.