การศึกษา, เส้นขยุกขยิก, พื้นหลัง, แบบแผน, วาดด้วยมือ, แปลก, ร่าง, ฉากหลัง, วิทยาศาสตร์, วิจัย, ฟิสิกส์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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