e-learning online education internet learning in open school or university virtual elearning icon button or sign
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- 大图:3600 × 3300 像素·30.48 cm × 27.94 cm·300dpi·JPG
- 中图:1000 × 917 像素·35.28 cm × 32.35 cm·72dpi·JPG
- 小图:500 × 458 像素·17.64 cm × 16.16 cm·72dpi·JPG