เคมี, โมเลกุล, H2, ไฮโดรเจน, โมเลกุลไฮโดรเจน, อนุภาค, ก๊าซ, ธาตุ, วิทยาศาสตร์, อะตอม, สีน้ำเงิน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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