The system includes two modules which are the foregroundsystem and the background system.
本次设计主要把系统分为前台系统和后台系统两个模块。
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These processes have no direct impact on the user experience, and the system can kill them at any time to reclaim memory for a foreground, visible, or service process.
Third-party products can provide additional functionality, such as a "theme" that enlarges fonts system-wide or one that provides high contrast between background and foreground.