What this poem really wants to describe is not a small tree, but the growth of a small tree, which shows that under the care of teachers, students grow sturdily like thriving small trees. Metaphor, praise the teacher. Campus refers to all kinds of scenery and buildings in the campus of a university, college or school; Any school's teaching land or living land can be called campus.
The campus is divided into kindergartens, primary schools, middle schools and universities.