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段落1

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

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Used to be, if you happened on a great tune on the radio, you might miss hearing what it was.

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Of course, now you can just Shazam it.

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let your smartphone listen, and a few seconds later, the song and performer pop up.

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Now scientists have developed a similar tool, for identifying dolphins.

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Every dolphin has a unique whistle.

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Like this: Dolphin whistle.

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Or this: Different dolphin whistle.

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They use their signature whistles like names: to introduce themselves, or keep track of each other.

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Mothers, for example, call a stray offspring by whistling the calf's ID.

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To tease apart who's saying what, researchers devised an algorithm based on the Parsons code,

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the software that mammals, I mean that fishes songs from music databases, by tracking changes in pitch over time.

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They tested the program on 400 whistles from 20 dolphins.

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Once a database of dolphin sounds was created, the program identified subsequent dolphins by their sounds nearly as well as humans who eyeballed the whistles' spectrograms.

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The findings appear in the journal PLoS ONE.

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Seems that in noisy waters, just small bits of key frequency change information may be enough to help Flipper find a friend.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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