ความรู้, หนังสือ, ความฉลาด, การศึกษา, ข้อมูล, นักธุรกิจ, ครู, ศาสตราจารย์, การวาดภาพ, ร่าง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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