Young person raising his arm to ask a question in the Classroom. A Blackboard with Math Formulas and Friendly Teacher in the dark background.
ID: 600480311
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- 大图:5250 × 3500 像素·44.45 cm × 29.63 cm·300dpi·JPG
- 中图:1000 × 667 像素·35.28 cm × 23.53 cm·72dpi·JPG
- 小图:500 × 333 像素·17.64 cm × 11.75 cm·72dpi·JPG