popelrainPart I1否定前缀un- uncomfortable, unacceptable, unavoidablein- incomplete, incapable, indispensable, inevitableim- imperfect, impartial, immortaldis- disable, disadvantagemis- misplace, mislead, misfortuneab- abnormalde- deactivate, degradeil- illegal, illiterateir- irregular, irrelativemal- malfunction, malnutrition2. trans across(横过)through(通过)beyond(那边)from one place to another transient 短暂的transplant 移植(器官)transaction 交易transitio