The theme of World Heart Day, "How Young is Your Heart" addresses prevention of cardiovascular diseases by controlling three major risk factors: diet, physical activity and tobacco use.

世界心脏日的主题“你的心脏有多年轻”，致力于通过控制三大危险因素饮食、身体活动和烟草使用来预防心血管疾病。

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A theme is a set of one or more formatting attributes that you can apply as a unit to all activities in an application, or just a single activity.

主题也是一套包含一个或多个格式化属性的整体，但却应用于一个应用程序中的所有Activity，或单独一个Activity。

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Currently, my school is launching an activity whose theme is that actions change the world to advocate the low carbon living.

目前，我的学校正在开展一项活动，其主题是行动改变世界，提倡低碳生活。

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"There is an underlying theme throughout the plan - partnership, pro-activity, prevention, " Mr Macpherson said.

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The project has been carried out during the 2008-2009 and 2009-2010 school years and was aimed at all teachers open to participating in a creative activity on the theme of water and science with their Primary or early Secondary school classes.

UNESCO: Natural Sciences