有嚴重裂縫的混凝土樑，細節逼真

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A highly realistic documentary-style close-up photo of a reinforced concrete structural beam with severe shear cracking. The scene shows the underside of a concrete building structure, with 1 large diagonal crack running from the lower left area upward toward the upper middle-right of the beam face, 1 secondary branching diagonal crack nearby on the left-center, and 3 thinner vertical to slightly irregular hairline cracks on the right half of the beam. The concrete surface is rough, weathered, pale gray, and speckled with small pores and aggregate marks, with darker grime and age staining near the ceiling slab and beam joints. Include a supporting concrete column at the far left, the underside of the beam visible along the bottom edge, and a dim industrial background below with shadowy pipes and structural elements out of focus. Lighting is natural and subdued, like an inspection photograph taken on site under a bridge or inside a parking structure. Composition is a straight-on medium close-up centered on the damaged beam face, emphasizing authentic structural deterioration, realistic texture, engineering-inspection accuracy, and no people, no safety signs, no overlay text.