了解Application生命周期之前我们先知道下面几个英文单词的意思，结合语句环境我们能更好的理解生命周期的具体含义。
active，inactive，resign，foreground。知道这几个词的意思配合语句的时态
application:willFinishLaunchingWithOptions
application:didFinishLaunchingWithOptions
applicationDidBecomeActive
applicationWillResignActive
applicationDidEnterBackground
applicationWillEnterForeground
applicationWillTerminate
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