Bfd
abbr. 双向转发检测机制（Bidirectional Forwarding Detection）；发现路由器转发故障的新协议；二进制文件描述符（Binary File Descriptor）
🗣️ 情景例句
Do you have anything to declare for customs?
有什么要申报呀？
Don't be afraid.
不用担心！
When is it going to be on the market?
什么时候上市啊