air defense chain的用法和樣例：
例句
- Assuming the enemy hasn't ramped up his air defenses, a couple of these can tell you all about his base.
如果敵人沒有建立起防空體系的話，幾個偵察機可以告訴你有關這個基地的所有事。 - 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.
所有的藏匿地點都有保護措施，任何軍事行動均只能部分抑制伊朗防空體系，而且，利用所有導彈和海軍力量來摧毀他們的攻擊力量。
