เกลียว, เศษส่วน, หมุน, มาบรรจบกัน, ดิจิตอล, วอลล์เปเปอร์, ออกแบบ, บทคัดย่อ, กระแสน้ำวน, สีเขียว, บั้งยศ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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