Diseases such as West Nile virus and dengue are becoming increasingly common as the insects that spread them move north.

中文翻译：

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欧洲蚊媒疾病激增——科学家们有多担心？


随着传播西尼罗河病毒和登革热等疾病的昆虫向北移动，这些疾病变得越来越普遍。