1.unforgettable英 [??nf?'ɡet?bl] 美 [??nf?r'ɡet?bl]adj.難忘的；不會忘記的It was an unforgettable experience.那是一次令人難忘的經(jīng)歷。

2.indelibility英 [?ndel?'b?l?t?] 美 [?ndel?'b?l?t?]n.不能消除；難忘I have forgot my indelibility recollection.我忘記了我最難忘的回憶.I have forgotten indelibility recollection.我忘記了我最難忘的回憶.