คิด, ตัวอักษร, ใบหน้า, ภาพเงา, การเสนอ, คำ, การแสดงนัย, เป็นมนุษย์, ความคิด, วาระ, กระบวนการคิด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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