บทคัดย่อ, หลุม, จุด, พื้นหลัง, รู, รูเข็ม, ตะแกรง, โคมไฟลิฟต์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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