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据伊朗新闻通讯社报道,2003年11月4日里海沿岸五国的部长及全权代表在伊朗首都德黑兰签署了《关于里海生态问题的德黑兰公约》。
According to the Iranian News Agency, the Ministers and plenipotentiaries of the five Caspian Sea coasts signed the Teheran Convention on Ecological Issues in the Caspian Sea in Tehran on November 4, 2003.