Optical grade with UV cut-off up to 400 nm, greater optical purity than standard grades.

光学级紫外截止到400纳米，大于标准等级的光学纯度。

youdao

Those are the two biggest rating agencies in the U.S. today and they're extremely powerful organizations because they --Standard & Poor's also does letter grades, a slightly different system, but almost the same.

如今他们是美国最大的两家评级机构,而且他们是非常权威的组织,标准普尔也进行字母评级,体系上有些区别,但基本相同

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In Scotland, pupils take Standard Grades, Highers and Advanced Highers rather than GCSEs and A-levels.

BBC: GCSEs replaced by 'English Bac' in key subjects

Markers have highlighted problems with basic English in this year's Standard Grades and Highers.

BBC: Scottish exam markers find errors in basic English

GCSEs are taken by pupils in England, Wales and Northern Ireland, but students in Scotland take Standard Grades.

BBC: Government to phase out modular GCSEs from 2012