![A classroom is observed from the perspective of a student in the Nanjing University of Aeronautics and Astronautics (NUAA) in Jiangning District, China. A female lecturer with long dark hair, wearing a grey full-zip sweater, stands behind a light-colored podium equipped with a black microphone. She is positioned in front of a green chalkboard displaying mathematical equations in white chalk, including calculus expressions like `f(x) = x + 1/x` and `f'(2) = lim h->0 [f(2+h) - f(2)] / h`, alongside a drawn coordinate plane with a curve, tangent line (T.L.), and normal line (N.L.). To the left of the chalkboard, a white projection screen displays text "Mathematics and Astronautics," "equation," and the NUAA logo. In the immediate foreground, the backs of several students are visible; one wears a dark blue hooded sweatshirt, another a light-colored top, and a third with curly dark hair wears a denim shirt. Desks with wooden tops and a grey computer monitor are discernible. A white three-blade ceiling fan is mounted overhead.](https://firebasestorage.googleapis.com/v0/b/patr-3a75e.appspot.com/o/uploads%2Fimage_picker_005a85ad-ca3a-4b63-a.jpg?alt=media)
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A classroom is observed from the perspective of a student in the Nanjing University of Aeronautics and Astronautics (NUAA) in Jiangning District, China. A female lecturer with long dark hair, wearing a grey full-zip sweater, stands behind a light-colored podium equipped with a black microphone. She is positioned in front of a green chalkboard displaying mathematical equations in white chalk, including calculus expressions like `f(x) = x + 1/x` and `f'(2) = lim h->0 [f(2+h) - f(2)] / h`, alongside a drawn coordinate plane with a curve, tangent line (T.L.), and normal line (N.L.). To the left of the chalkboard, a white projection screen displays text "Mathematics and Astronautics," "equation," and the NUAA logo. In the immediate foreground, the backs of several students are visible; one wears a dark blue hooded sweatshirt, another a light-colored top, and a third with curly dark hair wears a denim shirt. Desks with wooden tops and a grey computer monitor are discernible. A white three-blade ceiling fan is mounted overhead.
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