ลูกแพร์, เบา, พลังงาน, ดวงจันทร์, น้ำ, หยด, แสงจันทร์, การประหยัดพลังงาน, แสง, หลอดไฟฟ้า
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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