regional hub的用法和樣例：
例句
- Air traffic is regulated from control towers and regional centres.
空中交通由控制塔台和地區中心調度。 - After the accident, the Russian Ministry of Emergency Situations Siberian regional center immediately dispatched rescuers to the scene.
事故發生后，俄羅斯緊急情況部西伯利亞地區中心立即派遣救援人員趕赴現場。
