Chalkboard is another term for blackboard board to write on with chalk. Blackboard is reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate
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- 大图:5450 × 4000 像素·46.14 cm × 33.87 cm·300dpi·JPG
- 中图:1000 × 734 像素·35.28 cm × 25.89 cm·72dpi·JPG
- 小图:500 × 367 像素·17.64 cm × 12.95 cm·72dpi·JPG