通过使用 <split> 标签可以将幻灯片内容分为行和列的布局。
通过设置 even 属性，幻灯片上的内容将会被平均分配。
三个图片的情况下，每个图片占用可用宽度的
gap 参数能够让每个元素之间有间隔。
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s
when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap
into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem
在这个例子中，每个元素之间的间隙为 3em。
如果想按比例分割幻灯片，可以使用 Left & right 实现。 Left & right 表示分割的比例。
左边的元素宽度是右边元素的两倍。
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s
when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap
wrap 属性可以定义新行从哪个元素开始。
下面的PPT 将会拆成2 行，第一行4个图片。第二行2 个图片。
添加无边距参数，行和列之间的间隙会自动消除。