A D-, the lowest grade without failing.

我得了 D-，刚刚及格。

Students who don't get enough sleep have poorer attendance and lower grades.

缺乏睡眠的学生出勤率偏低，成绩相对较差。

The elementary principles of mathematics are taught in the lower grades at school.

学校低年级教数学的基本原理。

Most of his friends had been in lower grades or attended different schools already.

他的大多数朋友都上过低年级，或者已经上过不同的学校。

That's the lowest grade given among all the professional and amateurs sport organizations.

这在所有职业和业余体育组织中为最低分。

In discussions with students, she asks them how they can have such low grades.

在与学生的讨论中，她问他们怎么会得这么低的分数。

If you do not hand the assignment in ontime you will receive a lower grade.

如果你不按时交作业就会得低分。

The remaining ore is too low grade For the silver to be extracted using heat.

由于残银矿含银量太低 很难用高温方法提取纯银。

Teaching a lower grade level, Piercey is less worried about cheating than high school teachers.

相较于高中老师，教较低年级的皮尔西不那么担心作弊。

She pulled C's and a few B's, low grades, which didn't surprise me.

她得的大多是 C，以及几个 B，成绩不佳。对此我并不感到惊讶。