The US team produced the map by gathering data from geological surveys carried out by scientists from Germany, Canada, Denmark and Norway.

美国研究人员的制图方法是收集来自美国地质调查局的数据，这些数据由德国、加拿大、丹麦和挪威的科学家们提供。

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Last year, the first world map of happiness was produced, and Denmark came out on top.

去年，第一届世界快乐感地图诞生，丹麦人一举胜出。

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Tunnel and bridge links between Denmark and Sweden and, perhaps in eight years or so, between Denmark and Germany across the Fehmern Strait (see map) will enhance the Danes' role as a northern Euro-hub.

ECONOMIST: Nordic security: Getting better | The