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Grades are almost completely relative, in effect ranking students relative to others in their class. Thus extra achievement by one student not only raises his position, but in effect lowers the position of others.
分数几乎完全是相对的，实际上是学生相对于班上其他人的排名。因此，一个学生的额外成就不仅提高了他的地位，而且实际上降低了其他人的地位。