เสียงสะท้อน, เพลง, เครื่องมือ, ผู้พูด, คอลัมน์, ผู้รับ, เสียง, meloman, ระบบเสียงสเตอริโอ, อุปกรณ์, เทคโนโลยี
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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