The highest grade was AAA and that was the best grade you could get.
最高等级是AAA 级，那是你可获得的最好等级了。
It's the highest grade I've ever gotten in English!
这是有史以来我英文拿最高分的一次！
He went ape when he heard that he got the highest grade.
他听说自己得了最高分的时候，高兴得要发狂。
You had the highest grade, right?
你的分最高了，对不对？
The yellow wax is the most pure and therefore receives the highest grade.
黄蜡是最纯的因此级别最高。
The yellow wax is the most pure and therefore receives the highest grade.
黄蜡是最纯的因此级别最高。
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