求翻译：2011年10月31日，中华人民共和国、老挝人民民主共和国、缅甸联邦共和国、泰王国在中国首都北京举行了四国湄公河流域执法安全合作会议。是什么意思？

October 31, 2011, the People's Republic of China, the Lao People's Democratic Republic, Myanmar, the Federal Republic, the Kingdom of Thailand was held in the Chinese capital of Beijing Law Enforcement Security and Cooperation in the Mekong River Basin of Shikoku.

On October 31th in 2011, the People's Republic of China,the Laos people's democracy republic,the Burma federal republic,the 泰 Kingdom held the four country Mekong river valleyses to enforce the law the safety cooperation meeting in Chinese capital city, Peking.

On October 31, 2011, the People's Republic of China, the Laos people democratic republic, the Union of Burma republic, Kingdom of Thailand capital Beijing have held four country Mekong River basin law enforcement security cooperation conference in China.

On October 31, 2011, the People's Republic of China, the Lao People's Democratic Republic, Republic of The Union of Myanmar, the Kingdom of Thailand in the Chinese capital, Beijing, the four-nation law enforcement Conference on security cooperation in the Mekong River basin.

正在翻译，请等待...