The poor grades of school children are also frequently linked to the time spent on social networking sites, but it would be naive to believe there are no other contributing factors.

孩子们成绩差通常与他们在社交网站上花多少时间有关，但如果认为没有其他因素起作用，那就太天真了。

youdao

Students without enough sleep may get poor grades.

睡眠不足的学生可能会取得不好的成绩。

youdao

The son has since been expelled, officially because of poor grades.

然而他的儿子已被开除，校方理由是成绩恶劣。

youdao

Although the president has visited the Gulf coast three times since the spill began, he is getting poor grades.

VOA: standard.2010.06.10

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

耶鲁公开课 - 金融市场课程节选

He's not engaged in school and his poor grades don't reflect his obvious intelligence.

CNN: Behind the Scenes: Inner city kids travel to South Africa

Performance reviews have long received poor grades, even from those who conduct them.

WSJ: Performance Reviews Lose Steam

With poor grades himself, Mark knows it's education, education and education that offers the best hope of a future for Kurt.

BBC: Programme transcript