While you can program a theme entirely with PHP, a theme engine provides a framework for development and can save time.

可以完全使用PHP编写主题，但是主题引擎提供了一个开发主题的框架，使用它可以节省时间。

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A five-paragraph theme might also work as the framework for a short speech.

五段论也可以作为简短演讲的结构。

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The World Health Organization (WHO) selects "the WHO Framework Convention on Tobacco Control" as the theme of the next World No Tobacco day, which will take place on Tuesday, 31 May 2011.

世界卫生组织(世卫组织)选择“世界卫生组织烟草控制框架公约”作为2011年5月31日(星期二)下一个世界无烟日的主题。

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World Water Day 2013 will be celebrated on 22 March under the theme Water Cooperation, within the framework of the International Year of Water Cooperation 2013, coordinated by UNESCO on behalf of UN Water.

UNESCO: World Water Day on Water Cooperation