Among the many waterborne disease-causing viruses are hepatitis A and Norwalk; the pathogenic protozoa include Cryptosporidium, Entamoeba and Giardia.是什么意思_Among the many waterborne disease-causing viruses are hepatitis A and Norwalk; the pathogenic protozoa include Cryptosporidium, Entamoeba and Giardia.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句