แบบแผน, คลื่นความถี่, คลื่น, บทคัดย่อ, มีสีสัน, สี, เส้น, การเคลื่อนไหว, แกว่ง, เบา, พื้นหลัง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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