กระดานดำ, คณะกรรมการ, ชอล์ก, ดินสอสี, โรงเรียน, ลูกโป่งข้อความ, ภาพประกอบ, สัญญาณ, สัญลักษณ์, ออกแบบ, ฟอง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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