โทรโข่ง, ผู้พูด, ลำโพง, พูด, ดัง, การสื่อสาร, การประกาศ, ข่าวสาร, ประกาศ, เสียงร้อง, เสียงพูด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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