ผู้ชม, หอประชุม, การประชุม, เหตุการณ์, คำบรรยาย, สัมมนา, การเสนอ, ไมโครโฟน, ศูนย์การประชุม, เก้าอี้, การพูด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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