Summer study, please check out these tips for eye protection
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Summer vacation is here! How can we arrange our life and study properly, protect our eyes scientifically and healthily, and spend a happy, fulfilling and meaningful vacation? Please check out these eye protection tips! The text is compiled from People's Daily Online and Science Popularization China. |
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![[Visualization] How was my country's "Julang-1" solid-fuel strategic ballistic missile born?](/upload/images/67f257414bfa8.webp)
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