หัวใจ, หนังสือ, การเรียนรู้, อ่าน, หน้า, ความรู้, การศึกษา, ข้อมูล, วรรณกรรม, ศึกษา, กระบวนการเรียนรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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