การเสนอ, การศึกษา, ลำโพง, ฟิล์ม, ฟิล์มภาพยนตร์, แป้นพิมพ์, มัลติมีเดีย, การสื่อสาร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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