เรียน, เจริญ, การศึกษา, บันได, ลุกขึ้น, คน, ภาพเงา, ทักษะ, การเจริญเติบโต, การสอน, การอบรม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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