“ 传号 ” 或 “ 空号 ” 条件是由两条线之间的电压来表示的.The " mark " or'space " condition is represented by the voltage between two wires.打过, 但那个号码是空号.Yes, but the number's no longer in service.这个号码现在是空号.The number's no longer i...

“空号”的拼音为：kòng hào...

“空号”的英语可以翻译为：[讯] space，absentee，dead number ...