“I promise.” “ I swear to you it’ll never happen again.” “I give you my word.” “Honestly. Believe me.” Sure, I trust. Why not? I teach English composition at a private college. With a certain excitement and intensity, I read my students’ essays, hoping to find the person behind the pen. As each semester progresses, plagiarism（剽窃）appears. Not only is my intelligence insulted as one assumes I won’t detect a polished piece of prose from an otherwise-average writer, but I feel a sadness that a student has resorted to buying a paper from a peer. Writers hav