All the materials used were of the highest grade.

使用的材料全是优质品。

《牛津词典》

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。

youdao

You had the highest grade, right?

你的分最高了，对不对？

youdao

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

耶鲁公开课 - 金融市场课程节选

Dr Cary said Mr Reeve suffered the "highest grade of head injuries", which led to his death.

BBC: Barry Reeve

The reason Quality Systems does not get the Lynch strategy's highest grade is because its PEG ratio is 0.81.

FORBES: Tech Stocks Fit For Lynch And O'Neil

India boasts 15 of the 23 developers worldwide that are reported to have attained the highest grade, CMM level 5.

FORBES: Passage To India