班主任好比容嬷嬷
[bān zhŭ rèn hăo bĭ róng mā mā]
'Class Teacher Comparable to Lady Rongmo' compares their class teacher to a strict traditional maid from a historical drama or story, known as Rongmo (Lady Milkvetch) who has authority over young royals or nobles, suggesting strictness and seriousness but might also hint respect