抬头看到了班主任低头看到了容嬷嬷
[tái tóu kàn dào le bān zhŭ rèn dī tóu kàn dào le róng mā mā]
This nickname humorously describes a scenario where one looks up to see the homeroom teacher and looks down to see 'Rong Mamo' (a strict nanny in a classic TV series). It suggests constant surveillance and being constantly reminded about discipline.