เบา, กระเปาะ, ร้อนระอุ, หลอดไฟฟ้า, แสง, ใกล้ชิด, ใย, ที่เร่าร้อน, พลังงานแสง, เรืองแสง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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