In this paper,the characteristic and the source of ammonia nitrogen are studied in Yayao river,which is a typical inner river in the Pearl Delta Area.是什么意思_In this paper,the characteristic and the source of ammonia nitrogen are studied in Yayao river,which is a typical inner river in the Pearl Delta Area.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句