A stable mutated strain was obtained from the spores of josamycin producer S.narbonensis var. josamyceticus JOS-20 by purification.是什么意思_A stable mutated strain was obtained from the spores of josamycin producer S.narbonensis var. josamyceticus JOS-20 by purification.在线翻译_英语_读音_用法_例句