1 scene

2 scenario

3 setting

1 variant: 背 bēi

1 surname Jiao

1 classroom

2 classifier: 间 jiān

1 professor

2 to instruct

3 to lecture on

4 classifier: 个 gè

5 classifier: 位 wèi

1 arms around each other's shoulders (idiom)

1 (idiom) to teach in line with the student's ability

1 a good thing doesn't last forever (idiom)

1 to plant trees in order to stabilize sand (idiom)

1 lit. both the palm and the back of the hand are made of flesh (idiom)

2 fig. to both be of equal importance

3 to value both equally