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Researchers say planting and protecting will be needed to make sure cities can develop healthily, but more needs to be done to have a better understanding of city trees which may be different from countryside forests.

研究人员表示，为了确保城市健康发展，种植和保护树木是必要的，但我们还需要做更多的工作来更好地了解城市树木，因为它们可能与乡村森林不同。

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In this global village, countries need greater exchanges and understanding and cities should have more Bridges of communication and friendship.

在我们这个“地球村”，国与国之间需要更多增进交流和了解，城市与城市之间需要搭建起更多沟通、交流和友谊的桥梁。

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Our work also contributes to our understanding of ancient history, elucidating why some cities were abandoned or why mature societies suffered decline, and confronting the enduring attraction of fault lines in luring peoples, ancient and modern, to settle along persistent danger zones.

UNESCO: Tales set in Stone: learning from ancient earthquakes

But what he did try to do was give the 8, 000 attendees, and anyone else watching, an understanding of what is a real problem in America's inner cities.

CNN: Obama's 'quiet riots' are for real