Portuguese parade in downtown Lisbon, Portugal, on April 25, 2013, celebrating the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)

Portuguese parade in downtown Lisbon, Portugal, on April 25, 2013, celebrating the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)

Portuguese parade in downtown Lisbon, Portugal, on April 25, 2013, celebrating the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)

Portuguese President Anibal Cavaco Silva (L, Front) talks with Parliament President Assuncao Esteves (R) during a meeting in Lisbon, Portugal, on April 25, 2013, marking the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)

Portuguese parade in downtown Lisbon, Portugal, on April 25, 2013, celebrating the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)

Portuguese Prime Minister Pedro Passos Coelho (R) talks with Forein Minister Paulo Portas during a meeting in Lisbon, Portugal, on April 25, 2013, marking the 39th anniversary of the victory of the Carnation Revolution on April 25, 1974. (Xinhua/Zhang Liyun)