พจนานุกรม, หนังสืออ้างอิง, การเรียนรู้, ความหมาย, ความรู้, ข้อความ, การศึกษา, ข้อมูล, เรียน, หนังสือ, ศึกษา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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