คณะกรรมการ, โรงเรียน, การอบรม, ชอล์ก, เพื่อเรียนรู้, ป้าย, เช็ด, การสอน, กระดานดำ, ฝุ่น, ภูมิหลัง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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