Bfd
abbr. 雙向轉發檢測機制（Bidirectional Forwarding Detection）；發現路由器轉發故障的新協議；二進制文件描述符（Binary File Descriptor）
??? 情景例句
No, I think it's important to do it now.
不 ，我覺得還是應該現在動手術。
It's a long story.
說來話長。
He will be earning only half as much as he used to,
他將來掙的錢只有他現在的一半。