เรียน, ตัวอักษร, abc, แป้นพิมพ์, แปลง, เทคโนโลยี, ดิจิตอล, จดหมาย, อ่าน, การศึกษา, ไม่รู้หนังสือ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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