英语前缀；后缀前缀：re例：write rewrite un例：happy unhappy后缀：er例：work wor

eturn,repeat,recover,rebuild,retell
unfinished,unknown,unlock,undoubted,unable
doctor,employer,teacher worker famer painter writer dancer singer swimmer player runner
beautiful漂亮的
colourful多彩的
careful仔细的
meaningful有意义的
grateful感激的
helpful有帮助的
successful成功的