บทคัดย่อ, สิ่งประดิษฐ์, พิกเซล, พื้นหลัง, พื้นผิว, แบบแผน, มีสีสัน, สี, เนื้อผ้า, ผนัง, ธรณีวิทยา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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