低头看见了容嬷嬷抬头看见了班主任
[dī tóu kàn jiàn le róng mā mā tái tóu kàn jiàn le bān zhŭ rèn]
'Looked down to see Mama Rong and looked up to spot the teacher', alluding to the famous character in a Chinese period drama and a familiar strict schoolteacher. Used humorously, probably referring to always feeling scrutinized and under supervision, either by superiors or authority figures.