คิด, ความคิด, ความคิดสร้างสรรค์, นวัตกรรม, หลอดไฟฟ้า, การระดมสมอง, ไอคอนความคิด, สมอง, ออกแบบ, แนวคิด, เต็มความยาว
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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