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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

耶鲁公开课 - 金融市场课程节选

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

FORBES: Passage To India

It takes a double-size margin on premium gas, but the highest grade represents only 2% of its gasoline sales, versus 7% industrywide.

FORBES: Inconvenience

Arran first made headlines in 2001 when, at five years old, he gained the highest grade possible in the foundation maths paper.

BBC: Arran Fernandez