ม้วน, เกลียว, แป้งอบเปลือกแข็ง, ไหลวน, เศษส่วน, บทคัดย่อ, การเคลื่อนไหว, พลวัต, เส้น, ในการเคลื่อนไหว, สีเขียว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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