สมาธิสั้น, แบบแผน, พื้นหลัง, หนังสือ, การศึกษา, การบ้าน, ข้อมูล, แรงบันดาลใจ, ทางปัญญา, ความรู้, เรียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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