英文關鍵字
woman
writing
equation
whiteboard
covid
algebra
hand
marker
coronavirus
cabinet
lesson
maths
exams
students
female
courses
education
study
mathematics
preparation
英文關鍵字
woman
writing
equation
whiteboard
covid
algebra
hand
marker
coronavirus
cabinet
lesson
maths
exams
students
female
courses
education
study
mathematics
preparation