短語詞組短語Vacant t number 空號(hào)vacant national number signal 國內(nèi)空號(hào)信號(hào)vacant number intercept [通信]空號(hào)截接Vacant Number Tone 空號(hào)音V Vacant number 空號(hào)vacant number signal [通信]空號(hào)信號(hào) 返回 vacant number