In that virus, one old surface protein, the H, was switched out for a new one in a process called reassortment.The strain went from H2N2 to H3N2.是什么意思_In that virus, one old surface protein, the H, was switched out for a new one in a process called reassortment.The strain went from H2N2 to H3N2.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句