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1.Viruses are tiny infectious agents that can cause disease in humans and animals.
病毒是微小的传染性生物，可以引起人类和动物的疾病。
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2. The study of viruses is crucial for understanding the origins of life on Earth.
研究病毒对于理解地球上生命的起源至关重要。
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3. Viruses can be spread through contaminated food or water, making them a significant public health concern.
病毒可以通过受污染的食物或水传播，因此它们是一个重要的公共卫生问题。