บทคัดย่อ, ของเหลว, น้ำแข็ง, ลูกบาศก์, น้ำ, สี, แวดวง, พอร์ทัล
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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