air defense scheme的用法和样例：
例句
- Assuming the enemy hasn't ramped up his air defenses, a couple of these can tell you all about his base.
如果敌人没有建立起防空体系的话，几个侦察机可以告诉你有关这个基地的所有事。 - Many of the sites are protected, and any operation would have to suppress at least part of Iran's air defences, and all its missiles and naval power, to limit any retaliation.
所有的藏匿地点都有保护措施，任何军事行动均只能部分抑制伊朗防空体系，而且，利用所有导弹和海军力量来摧毁他们的攻击力量。
