หลอดไฟฟ้า, เส้นขยุกขยิก, พื้นหลัง, การสร้างความคิด, การศึกษา, ความคิด, นวัตกรรม, สติปัญญา, เทคโนโลยี, น่าทึ่ง, มืด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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