![In a classroom or lecture hall in Zhongtun, China, an educational exercise on concrete composition is projected onto a large screen. The screen displays the title "Concrete and concrete pro[ducts/perties]" followed by an "EXERCISE" detailing parameters for a concrete mix, including design strength grade C40, cement strength of 48.0MPa, crushed stone, sand, and tap water, with a prompt to "Try to calculate: The compos[ition]". Below the screen is a dark green chalkboard or wall.
In the mid-ground, a person with dark hair, wearing a dark green cardigan, faces the screen with their hands clasped over their head, possibly indicating concentration, thought, or a gesture of exasperation. A watch is visible on their left wrist. In the foreground, another person is seen from behind, with dark, short, curly hair and wearing a plaid shirt, also appearing to observe the presentation. The head of a third person is partially visible in the bottom right corner. The overall scene suggests a study or teaching session focusing on materials engineering.](https://xiw.io/cdn-cgi/image/width=1600,quality=95/https://storage.googleapis.com/patr-3a75e.appspot.com/uploads/image_picker_6e5490f1-973d-4f60-a.jpg)
jeexy_joe
Creator
Fri, Apr 24, 2026, 02:12 AM
Zhongtun, China
41.13800, 121.11700
In a classroom or lecture hall in Zhongtun, China, an educational exercise on concrete composition is projected onto a large screen. The screen displays the title "Concrete and concrete pro[ducts/pert…read more
stressed
concentrated
thoughtful
pensive
learning
Technical
ID
6e5490f1-973d-4f60-a
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