The teacher moderated his tone when the student burst out crying.

这个学生突然哭了起来，这时老师的声音变温和了。

youdao

The school has a very high teacher-student ratio.

这所学校的师生比例很高。

《牛津词典》

The teacher motioned the student who broke school rules to come to her office to have a talk with her.

老师示意破坏校规的那个学生跟她到办公室来，与她谈话。

youdao

In the 2011 U.S.federal budget, both NASA and the EPA propose to spend more than $146-million on programs to increase student and teacher proficiency in science and technology disciplines.

VOA: standard.2010.05.10

Unfortunately, the excitement about big data may obscure this important distinction and may end up degrading, rather than improving, the quality of the teacher-student connection.

FORBES: Fixing Education with Big Data: Turning Teachers into Data Scientists?

If a teacher is dealing with a student through social media and it's within the bounds of the teacher-student relationship, and it's related to school and all that, I have no comment on that.

WSJ: City Lays Out Digital Rules for Teachers

Infant mortality has declined, and some 100, 000 teachers have been hired to narrow the yawning teacher-student ratio.

BBC: Why Uttar Pradesh is India's battleground state