Realistic Chalkboard Text Rendering

A realistic photo of a classroom blackboard covered with handwritten chalk text, with natural daylight and authentic chalk texture. The image looks like it was shot on a phone and presents the full requested text clearly on the board.

手写在教室黑板上的{argument name="文字内容" default="出师表全文"}，真实感的粉笔字迹，{argument name="光照" default="晴朗白天"}用{argument name="拍摄设备" default="iPhone手机"}实拍