这介绍了应用程序的背景，截止日期是，明年3月。

This announces a context for an application for the deadline. It's next March.

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具有应用程序和基础设施方面的双重背景。

Have a background in both application and infrastructure.

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通常还说，应用程序窗口为程序内的所有信息提供了一个背景平台。

Programmatically, the window provides the background on which you present all your application's information.

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背景也是一样的应用程序，吃起来。

Same goes for background apps that eat it up.

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背景：我要增强现有的应用程序。

Background: I am about to enhance an existing application.

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背景：我要增强现有的应用程序。

Background: I am about to enhance an existing application.

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