防御素

例句：

1. 1.The army is defending the border againstinvading forces.
   军队正在边境抵御入侵力量。
2. 2. The police are on the sceneto provide defense to the injured.
   警察在现场为受伤者提供保护。
3. 3. Defensespending has been a majortopic of discussion in recent years.
   近年来，国防开支一直是热门话题。