At first, applications are more difficult to debug because the extra binding layer makes it harder to trace the flow of data between controls and domain objects.

首先，应用程序更难调试，因为附加的绑定层使追踪控件与域对象之间的数据流变得更难。

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In Figure 20 the Plane has two ControlSoftware objects and each one controls two engines.

在图20中Plane有两个ControlS of tware对象，而且每个控制二个引擎。

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The AnimationManager class controls the timer and sends animate messages out to the first item in its list of Animation objects.

AnimationManager 类控制定时器并向其 Animation 对象列表中的第一项发送动画消息。

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The set of controls allows using gestures for scrolling, selecting, rotating objects and controlling menus.

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