World Wetlands Day came from the Convention on Wetlands signed in Iran, China joined the convention on July 31, 1992.
世界湿地日源起于在伊朗签署的《湿地公约》，中国在1992年7月31日加入了该公约。
World Wetlands Day came from the Convention on Wetlands signed in Iran, China joined the convention on July 31, 1992.
世界湿地日源起于在伊朗签署的《湿地公约》，中国在1992年7月31日加入了该公约。
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