动词短语
中文翻译：颠倒等级
同义词：
['reverse', 'invert', 'reversal']
例句：
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1.The teacher asked us to invert our grades for the next test.
老师要求我们把成绩颠倒一下，以便准备下一次考试。
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2.Inverting the order of the letters in a word can change its meaning.
颠倒一个词中字母的顺序可以改变它的意思。
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3.When we were younger, we used to play games that involved inverting grades.
我们小时候喜欢玩一些需要颠倒年级的游戏。