Stake attention in this memory
An indoor, slightly tilted medium shot captures a classroom or lecture setting, likely in Zhongtun, China. The focal point is a projector screen displaying an exercise related to "Concrete and concrete properties." The text on the screen details a problem about reinforced concrete beams, specifying design strength (C40), slump (30-50mm), apparent density of concrete mixtures (2440kg/m³), and properties of raw materials: ordinary cement (strength 42.5/48.0MPa, density 3.10g/cm³), crushed stone (5-20mm, density 2700kg/m³), medium sand (density 2650kg/m³), and tap water. The task is to calculate the composition of materials for 1m³ of concrete. A date, "2023/2/20," is visible at the bottom of the slide. To the right of the screen is a dark green blackboard. A person with dark hair, wearing a dark green long-sleeved top, is standing in front of the blackboard, with their arms outstretched, seemingly explaining or gesturing towards it. Some handwritten text is visible on the blackboard, including "G" and "fcu,k." Part of another person's head with curly dark hair is visible in the lower right foreground. A white ceiling fan is partially visible in the upper left corner of the room. The overall lighting suggests an indoor, well-lit environment.
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