หลอดไฟฟ้า, แบบแผน, ออกแบบ, ไม่มีรอยต่อ, กระเปาะ, สติปัญญา, ตรรกะ, ความฉลาด, ฉลาด, ความเข้าใจ, ความคิด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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