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ÇÏõ¹Ù´Ú¿¡ ¹ö·ÁÁø Æó±×¹°, Æóºñ´Ò µî Æó±â¹° ¼ö°ÅÀÛ¾÷Collection of wastes thrown away on the river bottom such as waste net, plastic waste et al