บทคัดย่อ, แบบแผน, เส้น, คลื่น, การเคลื่อนไหว, แกว่ง, การหมุน, ตำบล, เบา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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