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