low grade

基本解释

Most of the ELC teachers will give you a low grade if you are often late.
如果你经常迟到，大部分的语言学校的老师都会给你打很低的等级。
Her grades were solid----except for one surprisingly low grade in geography.
她的成绩很好——除了地理成绩低得令人惊讶。
Your results will depend on your specific refractive error and other factors. People with a low grade of nearsightedness tend to have the most success with refractive surgery.
结果取决于具体的屈光误差和其他因素，屈光手术对近视度数低的人最成功。

Friday,Tehran delayed its response to a proposal made by the US, France and Russia to further enrich Tehran's existing stockpile of low-grade uranium.
They would say there is a low correlation between SAT scores and grade point averages in college, or maybe it's a high correlation.
媒体会说,SAT成绩,和大学里的平均学分相关性很低,或相关性很高
耶鲁公开课 - 金融市场课程节选
The IAEA draft deal calls for Iran to ship its stockpile of low-grade enriched uranium to Russia to be transformed into more highly enriched uranium for use in Tehran's medical research reactor.

If you have nausea, vomiting, diarrhea, low grade or no fever, it may be this norovirus you are suffering from.
FORBES: Norovirus: The Bug That Is Presently Making So Many Of Us Sick