public safety frequency bands

例句：

1. 1.The government has introduced stricter regulations for public safety frequency bands.
   政府已经对公共安全频段实施了更严格的规定。
2. 2.The new technology will help improve the efficiency of public safety frequency bands.
   这项新技术将有助于提高公共安全频段的效率。
3. 3. The research team is working on developing a new frequency band for public safety communication.
   研究团队正在开发一种新的频率波段用于公共安全通信。