To synchronize multiple active presentations, you may group presentation components with a control component.
为使多个活动表示同步，您可以用控制组件把多个表示组件归为一组。
For example, the control component can be used to determine which presentation component in a group is the active frame.
例如，控制组件可用于确定一个组中哪个表示组是活动的框架。
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