更换背景
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先修科目
说明
任何时候你都可以更换舞台上的背景，并且任何时候都可以选择想要的舞台背景。有两个积木用来更换背景。
积木：“下一个背景”
积木“下一个背景”属于“外观”类别的堆栈积木。它把背景换成列表中的下一个背景。
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如果当前背景是列表中的最后一个背景，这个积木就从头开始显示第一个背景。
积木：“换成( )背景”
积木“换成( )背景”也是“外观”类别的堆栈积木。它会把背景换成选定的背景。
它的使用方法如下所示：
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