大学教师在清晰黑板前授课

创作一张具有自然iPhone 16风格手机纹理的真实4:3教室照片：一位明确成年的大学教师正在讲授基础天文学；默认课程主题为基础天文学。让这位泛化的教师站在大型黑板旁，指向关于基础天文学的详细、清晰可读的粉笔介绍，并配有帮助理解的简洁粉笔图形和箭头。教室里没有学生，课桌推到后方或置于画外，环境为中性的学术墙面、柔和日光、真实粉笔尘和自然皮肤纹理，采用抓拍式纪实构图。黑板文字和图形只围绕所选课程主题，保持看似准确且清晰可读，不添加标志或额外编造文字。使用自然透视、中等景深、真实色彩和高细节手机摄影。不得出现学生、水印、解剖扭曲、无法辨认的涂写、带品牌的手机界面或影棚式魅惑灯光。

【English Prompt】
Create a realistic 4:3 classroom photograph with a natural iPhone 16-style smartphone texture, featuring one clearly adult university teacher presenting introductory astronomy; the default lesson topic is introductory astronomy. The generic teacher stands beside a large blackboard and gestures toward a detailed, legible chalk introduction to introductory astronomy, with simple chalk diagrams and arrows that aid understanding. The classroom is empty of students, with desks pushed back or out of frame, neutral academic walls, soft daylight, realistic chalk dust, natural skin texture, and candid documentary framing. Keep the writing and diagrams limited to the selected lesson topic, accurate-looking, and clearly readable without logos or extra invented text. Use natural perspective, moderate depth of field, realistic color, and high-detail smartphone photography. No students, watermark, distorted anatomy, illegible scribbles, branded phone interface, or studio glamour lighting.

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