บทคัดย่อ, เศษส่วน, แบคทีเรีย, มากมาย, อนุภาค, มืด, สีดำ, เนื้อผ้า, บทคัดย่อสีเทา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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