นักเรียน, ชาย, หนังสือ, อ่าน, ดีเอ็นเอ, เลือด, ชีววิทยา, วิจัย, โรงเรียน, เรียน, การศึกษา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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