คณะกรรมการ, เรียน, การศึกษา, การอบรม, ชอล์ก, สี, กระดานดำ, เขียน, กระดานชนวน, หลักสูตร, การสอน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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