Positive elderly teacher giving a math lesson in front of a group of students in the school
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- 大图:3307 × 2204 像素·28 cm × 18.66 cm·300dpi·JPG
- 中图:1000 × 666 像素·35.28 cm × 23.5 cm·72dpi·JPG
- 小图:500 × 333 像素·17.64 cm × 11.75 cm·72dpi·JPG