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In recent years, as the state attaches more and more importance to the ecological environment, and various laws and regulations have become more and more perfect for the protection of birds and ecology, the species and number of birds in Tianjin are increasing year by year. Over the years, the volunteers have collected audio and painting materials collected during bird watching and bird watching, and composed a "Sonata of Birds". (Reporter Ding Xu Hou Yu)
(Edited by Zhao Hui)
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