For unforeseen circumstances such as illness or emergencies, the lecturer or recitation instructor, at their discretion, may delete one problem set from the calculation of the homework grade.

对于那些不可预计的影响，例如疾病或者紧急事件，授课或者辅导老师将根据他们的判断删除一次作业或者不将这次作业的成绩计入最后成绩。