A-4

例句：

1. 1. The A-4 Skyhawk is a popular military aircraft.
   A-4喷气式战斗机是受欢迎的军用飞机。
2. 2. The A-4 was used for transporting troops during the Korean War.
   A-4在朝鲜战争中被用于运输部队。
3. 3. The A-4 has been retired from active duty, but it still serves as a symbol of ourmilitary history.
   A-4已经退役，不再执行现役任务，但它仍然是我们军事历史的一个象征。