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段落1

This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?

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Londoners love their fish.

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And according to a new study, in the early 13th Century they suddenly started importing it from as far away as the Arctic near Norway.

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The research is in the journal Antiquity.

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About the year 1000, sea fishing increased significantly in northern Europe.

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To see how that increase influenced urban growth, researchers looked at 95 excavation sites in London.

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Which included about 3000 bones from cod fish.

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Cod are decapitated before being dried for transport.

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So finding heads meant the fish were local.

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And the researchers found that as fish heads appear to decrease in the early 1200s, fish tails dramatically increased, a sign of importation.

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Examination of the chemical isotopes in the tails matched those for fish in waters far to the north, probably off Norway close to the Arctic, more evidence of import.

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The scientists do not know if the rapid switch from local to imported cod happened because local fish weren't as plentiful as the population increased,

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or if the market became flooded with dried imports from the north.

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But these fish tails tell a story of London becoming a growing economic center, and part of a globalizing fish trade.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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