Skydiving and bungee jumping are a common topic of conversation.

跳伞和蹦极已经成了人们日常谈论的话题。

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Before they can interact, the two portlets need to specify a common topic.

在它们可以交互之前，两个Portlet需要指定一个共同的话题。

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Part 2 introduces a common topic for almost all modern Web-based applications, the concept of user authentication.

第2部分介绍了所有现代基于Web的应用程序所共同的话题，即用户验证的概念。

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This way, like minded individuals can connect together on a common topic.

FORBES: You Had Me At 'Shalom'

Mental depression is such a common topic in lifestyle pages and pharmaceutical ads that Americans might be forgiven for thinking of it as a strictly modern malady.

WSJ: Robert Burton | The Anatomy of Melancholy | Digressions on a Diagnosis | Masterpiece by Danny Heitman