สับสน, สูญหาย, ความสับสน, กระดานดำ, การศึกษา, ลายมือ, ข้อความ, ภูมิหลัง, คำเดียว, ความคิดสร้างสรรค์, การเรียนรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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