เศษส่วน, การกระทำ, เกลียว, เป๋, ส่วนที่เป็นเกลียว, เส้นโค้ง, ศิลปะดิจิตอล, พื้นหลัง, บทคัดย่อ, สมมาตร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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