Back view Caucasian male lecturer writing math or physics formulas with chalks on blackboard. Man teacher working at school. Lesson of mathemathics. Mathematician. Geometry or algebra equation. Rear.
ID: 1815965909
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- 大图:4096 × 2160 像素·34.68 cm × 18.29 cm·300dpi·JPG
- 中图:1000 × 527 像素·35.28 cm × 18.59 cm·72dpi·JPG
- 小图:500 × 264 像素·17.64 cm × 9.31 cm·72dpi·JPG