Lesson15-The Riddle of time Word study 6. immune Word Formation adj. free: secure nimmunity 免除;免疫 Examples: V. Immunize be immune from taxation免税 使免除;兔疫 a be immune to/ against disease/infection/criticism W BTL E BACLesson15—The Riddle of Time W B T L E I. Word Study 6. immune adj. free; secure Examples: be immune from taxation 免税 be immune to/against disease/infection/criticism n. immunity 免除；免疫 v. immunize 使免除；免疫 Word Formation