This course uses an ungraded approach, suitable for students of various levels.

ungraded 由否定前缀 un-（表示"不、非"）和 graded（分级的）组成。graded 来自动词 grade（分级、评分），所以 ungraded 字面意思是"不分级的"，指不按学生水平划分等级的教学方式。