กลับ, กระดานดำ, ชอล์ก, โรงเรียน, เด็ก ๆ, แผนภูมิ, บทเรียน, ชั้น, โรงเรียนสีเทา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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