ศาสตราจารย์, เปิดหนังสือ, โลกบก, โลก, หนังสือ, โอกาส, ผู้สื่อสาร, หนุ่มน้อย, อธิบาย, คำอธิบาย, เรียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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