ชาย, ครู, ภาพเงา, คิด, การชี้, อ้างอิง, ออกแบบ, การประชุม, การศึกษา, เป็นมนุษย์, การตลาด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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