这使学生跟老师之间的交流更容易，而且让学生的书包变得更轻。

It makes communication between student and teacher easier - and it makes the student's schoolbag lighter.

youdao

这使学生跟老师之间的交流更容易，而且让学生的书包变得更轻。

It makes communication between student and teacher easier - and it makes the student's schoolbag lighter.

youdao