The -Denv=dev statement creates a system property named env and sets its value to dev, which activates the development configuration.

Denv=dev 语句创建一个名为 env 的系统属性，并将其值设为 dev，这激活了开发配置。

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All four dengue virus (DENV) serotypes were permanently in circulation, though the predominant serotype has alternated between DENV-3 and DENV-2 since 2000.

尽管2000年之后主导血清型在DENV - 3和DENV - 2之间交替，但是全部四种登革热病毒血清型一直在循环着。

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More than half of the cases have been caused by the DENV-4 strain of the virus, which was first detected in Brazil in 2011.

BBC: Brazil dengue cases almost triple as new strain spreads