สมอง, ใจ, ทางใจ, จิตวิทยา, หลอดไฟฟ้า, สติปัญญา, ความฉลาด, ความคิด, คิด, การระดมสมอง, มัลติทาสกิ้ง
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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