young student in casual writing physics formula on the empty blank blackboard during study course copy space mock up
ID: 1157307868
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- 大图:4913 × 2456 像素·41.6 cm × 20.79 cm·300dpi·JPG
- 中图:1000 × 500 像素·35.28 cm × 17.64 cm·72dpi·JPG
- 小图:500 × 250 像素·17.64 cm × 8.82 cm·72dpi·JPG