บทคัดย่อ, สีเขียว, สี่เหลี่ยม, แบบแผน, พื้นผิว, พิสัย, โครงสร้าง, เนื้อผ้า, ศิลปะ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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