陆海空三军

例句：

1. 1. The army is marching towards the enemy's position.
   军队正朝敌人的阵地前进。
2. 2. The Navy has been conducting a search and rescue mission in the area.
   海军一直在该地区进行搜救任务。
3. 3. The Air Force is responsible for air defense and support missions.
   空军负责防空和支援任务。