Create a realistic 16:9 modern smartphone snapshot taken on a sunny daytime in a classroom. The image shows a large green classroom blackboard covered with the full text of the classical Chinese memorial "Chu Shi Biao" handwritten in white chalk. Make the chalk handwriting feel authentic, slightly uneven, dusty, and hand-drawn, with natural chalk smudges, eraser marks, and subtle blackboard texture. Frame the blackboard from a real-life viewing angle, with part of the classroom wall, chalk tray, and simple classroom objects visible near the bottom. Use natural daylight, realistic exposure, mild phone-camera perspective, and an unpolished documentary-photo feeling. Keep the composition believable as a real classroom photo, not a graphic poster. The Chinese text should appear as clean chalk writing and be as legible and coherent as possible, while preserving the natural imperfections of handwriting.