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2024年1月8日 · The respiratory system is the organs and other parts of your body involved in breathing, when you exchange oxygen and carbon dioxide. All the cells in your body need oxygen to work. As they take ...
- Shawna Seed
2023年11月21日 · Scientists first identified a human coronavirus in 1965. It caused a common cold. Later that decade, researchers found a group of similar human and animal viruses and named them after their crown ...
- Linda Rath
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