Set up the new screen using Double dispatch.

使用双重分发设置新屏幕。

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If you double-click the new class glyph, you see a screen like this.

如果双击这个新类图标，就会看到屏幕变成如下所示。

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The screen are two kinds, single layer or double layer.

筛面可分单层或双层筛网。

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The screen are two kinds, single layer or double layer.

筛面可分单层或双层筛网。

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