กระดานดำ, ร่าง, ชอล์ก, เส้นขยุกขยิก, เด็ก, เด็ก ๆ, มีความสุข, ร่าเริง, ทางการศึกษา, ยิ้ม, ที่ยิ้ม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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