more keywords/comments soon!! (This was an official US Government [EPA] produced image officially released by the institution as part of their kid's outreach program, so it is public domain.)
數學圖標
EPA、icon、major、math、Math、numbers、school、science
EPA、圖標、重大的、數學、數學、數字、學校、科學
資料來源：openclipart ( https://openclipart.org/ )