提供通用的技术功能以支援其上的层次：应用层的消息发送，领域层的持久化，表现层的控件绘出，等等。
Provides generic technical capabilities that support the higher layers: message sending for the application, persistence for the domain, drawing widgets for the UI, and so on.
提供通用的技术功能以支援其上的层次：应用层的消息发送，领域层的持久化，表现层的控件绘出，等等。
Provides generic technical capabilities that support the higher layers: message sending for the application, persistence for the domain, drawing widgets for the UI, and so on.
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