Join works only if the files being joined share a common field.

join只有在所要连接的文件共享某个共同的域时才会工作。

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From the App Developers: Join Qik to share live video with anyone and everyone - or only share with the people you choose.

应用开发者有话说：加入Qik与大家所有人——或者只与您选定的人——分享视频直播。

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Entrepreneur Connect: Share ideas, join groups, publish content and promote your business on Entrepreneur's own network.

Entrepreneur Connect：这是美国《企业家》集团旗下的网站，在《企业家》自己社交网络中分享观点、参加团体、发表内容、促进你的交易。

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The National Preparedness Month Coalition gives everyone the chance to join together and share information across the United States.

WHITEHOUSE: The White House

Join us and share your experiences, thoughts and ideas.

CNN: Tonight: Join our Twitter chat on women, work and success

And while the East End of Long Island may seem unwelcoming for those without a banking dynasty, the young and the broke simply join forces and share rental properties, of which there are plenty, and travel back and forth from the city via train or the Hampton Jitney bus service.

BBC: Escape from New York