Students listening to lecture and making notes. Professor giving presentation in lecture hall at university.
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- 大图:3900 × 2600 像素·33.02 cm × 22.01 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