ภูมิหลัง, สีดำ, มืด, ตะแกรง, แวดวง, วิชาการ, ข้อมูล, ข้อมูลสีน้ำตาล, น้ำตาลเข้ม, วงกลมสีน้ำตาล
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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