The school has a very high teacher-student ratio.

这所学校的师生比例很高。

《牛津词典》

There is a great connection between the teacher-student relationship and the teaching effect.

师生关系与教学效果有很大关系。

youdao

Only if a teacher has given permission is a student allowed to leave the room.

学生只有得到老师的许可才能离开教室。

《牛津词典》

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

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

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?

In fact, teacher-student interaction was one of the pillars.

FORBES: More Interaction In Online Courses Isn't Always Better