单词	duplicate a letter
释义	duplicate a letter 复写信件
随便看	simple sampling inspection plan simple sampling without replacement simple scale constant simple scale difference simple scalp pityriasis simple scan simple scanning simple scarf joint Simple scarlatina simple scarlet fever simple schizophrenia simple screening simple screen management protocol Simple scrotoplasty simple search Simple secure password textbox example simple security condition simple security property simple sedimentation simple segregation analysis simple segregation equation simple selection simple selection procedure simple selector simple self-climb construction platform