หนังสือ, กอง, การศึกษา, โรงเรียน, บทเรียน, ความรู้, ตำรา, เรียน, นักเรียน, แล็ปท็อป, หูฟัง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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