应用程序支持IOS 4的应用程序切换，所以你不会失去你的位置。
The app supports iOS 4 app switching, so you won't lose your place.
例如，假设在新年的开始，您希望将应用程序切换到新的子系统，以便于目录管理。
For example, imagine that at the start of the New Year (after all the confetti has been cleaned up) you want to switch your application over to a new subsystem for inventory management.
当你在开车时，你可以用它进行程序切换； 或者当你在走路时，不想用手按按键，它也可以很好的帮你完成各种功能。
This is a game changer if you want to use your phone in your car or you want to walk without having to type.
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