网申有一篇Optional Essay是这么说的: You are strongly encouraged to provide an additional statement toclarify and explain any of the following: gaps of more than three months infull-time employment, lack of recommendation from your current or most recentsupervisor, limited full-time work experience (ignore if you are a recentundergraduate), poor academic performance, weak test scores, academicmisconduct, violations of the law, or anything else you think is important forthe Admissions Committee to know about you that is not already addressedelsewhere in your application. Applicants reactivating a previous applicationsubmitted within the last two years should provide their additional statementhere.