คณะกรรมการ, กระดานดำ, กรอบ, ผนัง, พื้นหลัง, ว่างเปล่า, กระดานชนวน, โรงเรียน, ชอล์ก, เขียน, การศึกษา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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