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The letter was written by Darwin to thank an American geologist, Dr. Ferdinand Vandeveer Hayden.

这封信是达尔文为感谢美国地质学家费迪南德·范德维耶·海登博士而写的。

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Joplin moved to Saint Louis with a woman named Belle Hayden.

VOA: special.2010.01.24

Among them was Retired Air Force General Michael Hayden, who held the post from 2006 until early this year.

VOA: standard.2009.04.20

Communications equipment, armor, night vision goggles, and vehicles are among items being discussed, Hayden said.

CNN: All options on the table regarding Syria, US officials

With Adam Gilchrist and Matty Hayden well set, de Silva was roughly treated on this occasion.

BBC: De Silva still hitting the mark

Michael Hayden, principal deputy director of national intelligence, calls "hot pursuit" of al Qaeda conversations.

CENTERFORSECURITYPOLICY: Our right to security