A male instructor is presenting a physics or mathematics lecture in a classroom located in Jiangning District, China. The instructor, of East Asian descent, is seen from the chest up, positioned on the right side of the frame, facing slightly left towards a large white projector screen. He wears a dark, long-sleeved, loose-fitting shirt, and a black lavalier microphone is clipped to his collar. He holds a silver pointing stick with a red handle in his right hand, directed towards the screen. The projector screen displays equations related to "Scalar products of vectors," including $\vec{A} \cdot \vec{B} = |\vec{A}| |\vec{B}| \cos \alpha_{AB}$, coordinate representations, and a diagram illustrating the projection of vector $\vec{A}$ onto $\vec{B}$. Above the screen, a white projector is mounted on a suspended acoustic tile ceiling. To the instructor's right, a dark green blackboard is visible, with faint white chalk markings. A wooden lecture stand with a light-colored top surface is in front of the instructor, holding a white marker or pen. A white electrical switch or outlet is mounted on the light-colored wall above the blackboard. in Jiangning District, China

$A male instructor is presenting a physics or mathematics lecture in a classroom located in Jiangning District, China. The instructor, of East Asian descent, is seen from the chest up, positioned on the right side of the frame, facing slightly left towards a large white projector screen. He wears a dark, long-sleeved, loose-fitting shirt, and a black lavalier microphone is clipped to his collar. He holds a silver pointing stick with a red handle in his right hand, directed towards the screen. The projector screen displays equations related to "Scalar products of vectors," including $\vec{A} \cdot \vec{B} = |\vec{A}| |\vec{B}| \cos \alpha_{AB}$, coordinate representations, and a diagram illustrating the projection of vector $\vec{A}$ onto $\vec{B}$. Above the screen, a white projector is mounted on a suspended acoustic tile ceiling. To the instructor's right, a dark green blackboard is visible, with faint white chalk markings. A wooden lecture stand with a light-colored top surface is in front of the instructor, holding a white marker or pen. A white electrical switch or outlet is mounted on the light-colored wall above the blackboard.$

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Mar 25, 2026, 7:26 AM

Jiangning District, China

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A male instructor is presenting a physics or mathematics lecture in a classroom located in Jiangning District, China. The instructor, of East Asian descent, is seen from the chest up, positioned on the right side of the frame, facing slightly left towards a large white projector screen. He wears a dark, long-sleeved, loose-fitting shirt, and a black lavalier microphone is clipped to his collar. He holds a silver pointing stick with a red handle in his right hand, directed towards the screen. The projector screen displays equations related to "Scalar products of vectors," including $\vec{A} \cdot \vec{B} = |\vec{A}| |\vec{B}| \cos \alpha_{AB}$, coordinate representations, and a diagram illustrating the projection of vector $\vec{A}$ onto $\vec{B}$. Above the screen, a white projector is mounted on a suspended acoustic tile ceiling. To the instructor's right, a dark green blackboard is visible, with faint white chalk markings. A wooden lecture stand with a light-colored top surface is in front of the instructor, holding a white marker or pen. A white electrical switch or outlet is mounted on the light-colored wall above the blackboard.

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