air-defence sighting telescope

例句：

1. 1.The air-defence observer used a telescope to monitor the enemy's movements.
   防空观察员使用望远镜监测敌人的动向。
2. 2.The military has developed an air-defence observation telescope that can detect incoming missiles.
   军方已经研发了一种防空观察望远镜，可以探测来袭导弹。
3. 3.The scientist used the air-defence observation telescope to study the behavior of birds during migration.
   科学家使用防空观察望远镜研究鸟类迁徙时的行为。