a gray-brown mixture consisting mainly of tryocidine and gramicidin,used as a topical antibiotic in treating infections caused by gram-positive bacteria是什么意思_a gray-brown mixture consisting mainly of tryocidine and gramicidin,used as a topical antibiotic in treating infections caused by gram-positive bacteria在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句