Seen in this way, a group of white blood cells called T cells are the frontline soldiers of immune defense, engaging inading pathogens head on.是什么意思_Seen in this way, a group of white blood cells called T cells are the frontline soldiers of immune defense, engaging inading pathogens head on.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句