โรงเรียน, คณะกรรมการ, คณิตศาสตร์, กระดานดำ, การสอน, ตัวอักษร, เด็ก ๆ, ชั้น, เรียน, ชอล์ก, เขียนกระดาน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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