social distancing concept bright empty classroom for lessons Old chairs and table in the classroom Blank green chalkboard School chalkboard Chalk texture traces erased school board display
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- 大图:5000 × 2394 像素·42.33 cm × 20.27 cm·300dpi·JPG
- 中图:1000 × 479 像素·35.28 cm × 16.9 cm·72dpi·JPG
- 小图:500 × 240 像素·17.64 cm × 8.47 cm·72dpi·JPG