Young man writing and drawing mathimatic formulas and drafts on a black blackboard. Concrete background. Back view. Concept of studying.
ID: 360084236
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- 大图:5235 × 4461 像素·44.32 cm × 37.77 cm·300dpi·JPG
- 中图:1000 × 852 像素·35.28 cm × 30.06 cm·72dpi·JPG
- 小图:500 × 426 像素·17.64 cm × 15.03 cm·72dpi·JPG