You can create a new slide master in a similar way to modifying the default slide master.

您可以用与修改默认的幻灯片母版类似的方式，来创建一个新的幻灯片母版。

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After this method is invoked, the master page is applied to the new slide.

调用该方法后，母版页就应用到新幻灯片。

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You can also apply a Master slide to a group of slides.

你还可以将主幻灯片应用到一个幻灯片组。

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Both do the basics: create slides using text, tables, charts, graphics and other multimedia elements, let you apply a master design to them, organize the slides into a slide show and play them or print them out as a presentation.

FORBES: Keynote Vs. PowerPoint