我的班主任是容嬷嬷的女儿
[wŏ de bān zhŭ rèn shì róng mā mā de nǚ ér]
'My class teacher is the daughter of Aunt Rong,' a reference to the famous TV series 'The Empresses in the Palace' where Aunt Rong was a strict caretaker, implying the teacher has a similar stern character.