◎ 留级 liújí[be made to repeat a course at school;fail to go up to the next grade;stay down] 因学年成绩不及格留在原来的年级重新学习,不能升级 -----------------国语辞典:学生的学业成绩未达升级标准,而留在原来的年级重读。如:「这次期考你再不好好准备,铁定会被留级。」也作「留班」。反跳级,升级
◎ 留存 liúcún(1) [preserve;keep]∶保存(2) [keep on file]∶存放此稿留存(3) [remain;be extant]∶存在;未消失-----------------国语辞典:保存、保留。如:「他仍留存著童年时收藏的书签。」近保存反淘汰,淹没英语 to keep, to preserve, extant, to remain (from the past)德语 Verbleib (S), zurücklegen (V)法语 garder, conserver