regional hub的用法和样例：
例句
- Air traffic is regulated from control towers and regional centres.
空中交通由控制塔台和地区中心调度。 - After the accident, the Russian Ministry of Emergency Situations Siberian regional center immediately dispatched rescuers to the scene.
事故发生后，俄罗斯紧急情况部西伯利亚地区中心立即派遣救援人员赶赴现场。
