ละลาย, ทอง, ของเหลว, โลหะ, ความร้อน, ไหล, สีเหลือง, ร้อน, โลหะวิทยา, การผลิต
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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