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Explanatory titles are primers - quick summaries of the information on the slide (e.g. "Project costs for 2010 are well within budget").

解释性标题则是引子—快速地总结片子的信息(例如，“2010年成本未超预算”)。

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Note: This option is available if you have not selected project or master slide background.

注意：如果你没有选择项目可主幻灯片背景则这个选项可用。

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The masks were little more sophisticated than an old color slide used to project a picture on a screen.

FORBES: Trick of the Light