education high school university learning and people concept - close up of teacher with tablet pc computer and students at lecture hall
ID: 509352070
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- 大图:4901 × 3267 像素·41.5 cm × 27.66 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