When I was teaching a Grade One class, Billy's tooth just popped out.

我那时正在教一年级的一个班。比利的一颗牙齿掉下来了。

youdao

Class One grade Seven, this is my class.

七年级一班，这是我的班级。

youdao

Before class ended, one student asked if the last question would count toward our grade.

下课前，一个学生问最后一个问题是否算在我们的分数里。

youdao

One thing I can guarantee from past experience in this class, is that the median grade will be a B+.

不过从教学经验看,中间成绩应该是B+

耶鲁公开课 - 博弈论课程节选

One example is the Harlem Village Academy, which opened in September 2003 with one class of fifth graders and has been growing one grade per year since.

FORBES: Fact and Comment

As part of my job, I reported alarming inadequacies: in one case high-grade equipment (ASME III, class 1) was operated in nuclear power reactors with no accepted safety file, regardless of a previous accident and a half-dozen failures in achieving acceptable design results.

BBC: Can nuclear power ever be safe?

He said she had raised her grade to an A this semester, one of the top in the class, he said.

WSJ: Chinese Pour Out Grief for Student