Whiteboard hand-drawn marker educational illustration, [画面比例], explaining [主题].
Title: "[主标题]" in bold black handwritten marker.
Layout: [思维导图 / 步骤流程 / 对比表 / 鱼骨因果图 / 系统分层架构].
Include sections for [要点一]、[要点二]、[要点三]，each with a simple cartoon doodle, short Chinese label and optional speech bubble.
Realistic whiteboard surface, aluminum frame, subtle eraser smudges and reflections. Black marker base lines with red and blue emphasis; add hand-drawn arrows, circles, underlines and lightbulbs. Energetic, practical, easy to understand, clear hierarchy, high resolution.