focused male teacher in formal wear looking at camera and holding wooden pointer in front of chalkboard with equations
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- 大图:6992 × 4666 像素·59.2 cm × 39.51 cm·300dpi·JPG
- 中图:1000 × 667 像素·35.28 cm × 23.53 cm·72dpi·JPG
- 小图:500 × 334 像素·17.64 cm × 11.78 cm·72dpi·JPG