الطاقة النووية ، ذرة ، النواة الذرية ، وحدة ، مركب ، بروتون ، إلكترون ، نيوترون ، رجل ، خيال ، الانزلاق
الصور ذات الصلة الخالية من حقوق الملكية
- Public Domain
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