网络释义
1)direct distance dial network,直接长途拨号网2)direct distance dialing,直接长途拨号3)direct distance dialing ,DDD,长途直接拨号电话4)direct distance dialing (DDD),直接长途拨号电话5)DDD (direct distance dialing),长途电话直接拨号6)IDDD (international direct distance dialing ),国际直接长途拨号