John Hildebrand: the animals had decreased the pitch of their songs by about 30% from the 1960s to today.

约翰·希尔·德布兰：从上世纪60年代至今，这种动物已经将他们歌声的音高降低了大约30%。

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That’s according to John Hildebrand of the Scripps Institution of Oceanography in San Diego. He published a 2009 study on whale songs.

希尔德布兰在09年发布了一篇关于蓝鲸之歌的研究。

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Mr. HILDEBRAND: Well, we're quite pleased to let John McCain and his operation believe that they're running a smart and sophisticated operation.

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