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1.The parasite is responsible for the death of many people in this region.
这种寄生虫导致该地区许多人死亡。
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2. This disease is caused by a specific type of bacteria that can be transmitted through contaminatedfood or water.
这种疾病是由一种特定的细菌引起的，可以通过受污染的食物或水传播。
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3. The study found that the parasite was able to survive and reproduce even in the absence of human hosts.
研究发现，这种寄生虫即使在没有人类宿主的情况下也能生存和繁殖。