VIENTIANE, May 25, 2016 (Xinhua) -- The director of Laos-China Friendship Association and mayor of Vientiane Sinlavong Khoutphaythoune addresses a symposium marking the 55th anniversary of the establishment of diplomatic ties between China and Laos and the 40th anniversary of friendship associations of the two countries in Vientiane, capital of Laos, May 25, 2016. (Xinhua/Liu Ailun)