บทคัดย่อ, สายไฟ, เส้น, เส้นโค้ง, พัน, การบิด, มีสีสัน, เกลียว, หมุน, กระแสน้ำวน, เป๋
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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