บทคัดย่อ, เศษส่วน, แบบแผน, ล้างออก, น้ำ, ของเหลว, ส้ม, ฝุ่น, ฟอร์ม, ทิศทาง, ลูกศร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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